MouseCraft

MouseCraft is a puzzle game that should appeal to casual gamers and hardcore puzzle enthusiasts alike. Finding one solution to pass a level is usually trivial, but if you aim to collect every anima shard and get all three mice to the cheese, you might be in for a challenge.
The first stage is relatively simple and does a good job of introducing you to the gameplay mechanics. By the end of stage two though, I found myself genuinely stumped at some of the puzzles. I probably spent a good ten minutes or more figuring out some of those last challenges.
The game also has a cutesy story in between stages that I found charming in a quirky way. If you've played these kinds of puzzle games before, you probably know what to expect in terms of exposition. It's never going to win a video game award for best story, but it serves its purpose in providing some small reward for progression.
Overall, the 80 levels should take 6-10 hours to complete, depending on your skills with puzzle solving, and there's enough variation to keep you entertained throughout the game. There is also a very good and intuitive level editor that should provide additional content through Steam Workshop when support for it is added. In the meantime, it's possible to share and download player created levels via a Dropbox account the developer has set up.
It's a game I don't hesitate to recommend and it is among my absolute favourites in the puzzle genre.

~=Updated to reflect the official release=~
Quick rundown:
* Straightfoward gameplay;
* Appealing to all ages;
* Well polished;
* Colorful graphics;
* Good soundtrack;
* Easy cheevos for achievement hunters;
* Enough content to justify the price (the level editor is awesome!).
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Mousecraft is a delightful casual experience. The puzzles are straighforward, but propose a nice, non-frustrating challenge should you decide to get a "Perfect" rating.
I think the game finds a nice balance in its audience as it can appeal to both the young and the "old." From personal experience, teenagers and overall competitive people will not enjoy the game very much as it is not fast paced and does not rely on skill, but rather your ability to analyze a situation and consider all the elements that are part of it. It does have leaderboards, but the scoring system is a bit obscure, making competition somewhat pointless.
To me, it is a perfect game to play after a stressful day to unwind. It is colorful, cute, and the cat scientist on the background, Schrödinger, always makes me smile with his reactions to the things you do. So, even if you fail a puzzle, it is still fun to watch him react to it -- you don't feel like you're losing, but that you should try better next time.
I'd also recommend this game to achievement hunters: it is very easy to get all the achievements; the second quickest I ever played. So even if you're not into puzzles, it should be simple to get it to 100% (especially with all the guides already available) and crank up your achievement percentage up a bit. Plus you'll be supporting a really cool indie developer -- they're awesome, hard-working people that have a lot of creativity and good ideas to share.
I've followed this project for quite a long time while it was in development, and I must say they did quite a good job, especially for being their first game. The quality is impressive, and the amount of polish shows they're really enjoying what they are doing. That alone makes them deserve our support. Crunching Koalas is an innovative indie game developer that brings that much-needed breath of fresh air to our gaming community, and I am looking forward to many other great games they might create.

Its good looking puzzle game. Its just too easy. For 80 levels i had to think a little bit harder about maybe 4 or 5 of them.
+ simple game mechanics have great potential to create something amazing (maze + tetris like pieces with different functions),
+ you can to do it yourself in built in level creator (huge plus for implementing this),
- to unveil its true value this game should have Steam Workshop!!! I would love to see what puzzles were created by other people!!!
I had some fun with this little game, but if you are looking for something challenging - it is not the game you are looking for.

Nice and smart iteration of Blocks That Matter (BTM) and Tetrobot & Co. (T&Co) ideas.
It’s about:
helping mice get their deserved piece of cheese by setting up blocks of widely-known shapes and using level's enviroment;
deliver all mice to extraction point safely for higher score;
collecting special crystals to unlock next levels;
collecting bombs and exploding some of the blocks to clear the way or "create" a way;
avoiding deadly raptoids - mechanized rats who're trying to hunt your mice down;
sophisticated ways to execute raptoids: drown them in acid, give an electric shock, explode with special "TNT"-blocks or just drop one of your default blocks on its head;
finding out the reason why this scientist-cat invented all that (my personal applause for the ending).
Why you should play this:
you played BTM or T&Co., liked it and looking for something very similar;
indirect control brings fresh air to the puzzle - you need to predict consequences, not "do then think how to deal with consequences";
it certainly develops your imagination;
mice facing the obstacle not just stop and stand still - they turn around and moving in opposite direction: sometimes it's the core to beat another level;
enviroment and kind of blocks are changing - you unlock new features by completing levels;
"Undo" and "Pause" buttons help to keep your hair on.
Why you may not like it:
some of the levels look overloaded with blocks and details - they usually can be solved just with enumeration of possibilities;
as any puzzle game after some time it can feel boring;
100 levels would be better and look more round number than 80.
15 hours of brainstorm for 10 seconds of laugh in the end. And, that's worth it!

Information / Review English
MouseCraft is a logic & creativity game developed by Crunching Koalas.
Gameplay / Story
In MouseCraft you slip into the role of the slightly crazy looking cat scientist Schrödinger, who wants to lure as many mice as possible to his invention in order to use their energy for his plans. The aim is to guide the mice to the cheese with the help of Tetris puzzle pieces. The parts can be rotated, placed and destroyed. There are also special power-ups available to you in the further course, where you need to complete the respective level.
Pro
+ Combination of Lemmings and Tetris
+ 80 handcrafted levels
+ addicting gameplay
+ Full controller support
+ Natural hazards, bombs, enemies
+ Editor
+ Community content
+ Achievements and trading cards
Contra
- Some levels are really difficult
- short playing time
Conclusion
MouseCraft offers you a mixture of Lemmings and Tetris, which enables you to play a tactical puzzle game. Clear buy recommendation.
Information / Review Deutsch
MouseCraft ist ein Logik & Kreativität-Spiel, welches von Crunching Koalas entwickelt wurde.
Gameplay / Geschichte
In MouseCraft schlüpft ihr in die Rolle des leicht verrückt anmutenden Katzen-Wissenschaftlers Schrödinger, der möglichst viele Mäuse zu seiner Erfindung locken will, um ihre Energie für seine Pläne zu nutzen. Es geht darum, die Mäuse mit Hilfe von Tetris-Puzzelteilen zu dem Käse zu führen. Dabei können die Teile gedreht, platziert und vernichtet werden. Dir stehen im weiteren Verlauf auch spezielle Power-Ups zur Verfügung, wo du benötigst um das jeweilige Level abzuschließen.
Pro
+ Kombination aus Lemmings und Tetris
+ 80 handgefertigte Levels
+ süchtiges Gameplay
+ Volle Controllerunterstützung
+ Naturgefahren, Bomben, Feinde
+ Editor
+ Community Inhalte
+ Errungenschaften und Trading Cards
Kontra
- Level teils echt schwer
- kurze Spielzeit
Fazit
MouseCraft bietet dir eine Mischung aus Lemmings und Tetris, welches dir ein taktisches Denkspiel ermöglicht. Klare Kaufempfehlung.

I got this in a bundle and I must say the trailers left me skeptikal: I thought the game would be very basic with little variety and creativity. But thankfully, Mousecraft is much better than I first thought.
You must help mice reach each level's destination and collect crystals along the way. The mice go mindlesly forward and your only way to help them is by using Tetris-like blocks to make them a viable path. It sound basic, but Mousecraft regularly introduces new kinds of blocks (explosive, bouncy, fragile, recyclable...) and hazards. Coupled with some clever level design, it keeps things fresh until the end. I found the general difficulty level perfectly suited to my tastes: it often requires careful thinking and planning, while remaining solvable for non-superhuman beings (I'm looking at you, Spacechem!)
All is not rosy though. There are some issues, none of them game-breaking, but slightly annoying:
- Mild bugs
- While I enjoyed the general difficulty level, the difficulty curve was somewhat random with some levels in the middle much more difficult than those in the end.
- The visuals and music lack variety. It makes Mousecraft look more like a mobile game than a fully-fledged PC title.
But overall, it's well worth the time and money for puzzle enthusiast who appreaciate a reasonable challenge.

this game is already great although i'ts still in early access!
+ Tetris and lemmings combination
+ Nice Music
+ Great Design
+ No in-game bugs
+ Challenging puzzles
- Only 30 levels
- Steam Trading card doesn't work