Noita

Every run ends with me saying "i wonder what this does"

There is so much more to this game than meets the eye.
The basics:
You play as a mage. 
You kill enemies with your wands/spells.
You progress downward through levels and reach safe zones where you can purchase new wands, spells and perks.
When you die, it's game over and the entire game restarts (quite literally due to the design).
If you progress far enough you'll reach the end-game boss. 
Defeat said boss to achieve victory!
Sounds simple enough, right? Well...
You have one life and there are no saves.
Zero hand-holding. The game tells you the controls and off you go to explore and die.
Enemies do not fuck around. They will wreck your shit.
Bosses laugh at you and ragdoll your corpse if you're not prepared.
Everything else can and will kill you.
You'll think you're having a good run, then BAM! Death by falling rocks, exploding barrels, hidden traps, lava, acid, electricity, panicking, pressing the wrong key at the wrong time - the list goes on and on.
Pros:
Wand building and player perks.
There's a HUGE variety of spells for your wands as well as player perks.
Spells can be linked together in weird and wonderful ways for maximum carnage. 
It's insanely fun (and dangerous) experimenting with different spell and perk combinations.
Exploration and secrets.
Without spoiling too much, the game is a lot larger than it appears. 
Try going off the beaten track and see what you can find. 
There's a lot of secrets to be discovered. Some are massively cryptic though, so I found myself having to search for answers online.
Enemies and bosses.
Awesome variety of enemies with unique stats and abilities.
You'll find yourself learning enemy behaviour and capabilities.
A spell which is effective against one enemy might be totally useless against another.
Pure destruction.
Everything in the game can be destroyed in one way or another.
Solid rock can be nuked into oblivion, liquids turned into gas and flammable items burned so you can unleash your inner pyro.
Potions/liquids.
You can collect all kinds of liquids in bottles which act as utility items.
For example, some put out fires while others provide temporary buffs (and debuffs).
There's so much more I want to say, but it's way more fun and rewarding discovering these things for yourself.
Cons:
RNG can be a bitch sometimes.
The random spells, wands or potions you find might be undesirable depending on your situation.
On the flipside it pushes you to adapt and figure out how to make it work in your favour.
There's also a certain event which makes all of the safe zones very unsafe. I won't say what it is or how it happens but it's normally triggered by you the player. Sometimes it can seemingly happen at random and will make the remainder of your run a lot more painful.
Singular pixels.
It's not uncommon to accidentally explode yourself because you did not see a single pixel right in front of you during a fight.
It's also quite easy to become blocked or trapped by a single pixel while you're manoeuvring or fleeing.
No saves or difficulty setting.
I personally do not think this is a bad thing, but others might. The game is designed to be challenging and harsh.
You will die easily and frequently.
Losing everything after many hours of hard work can be really frustrating but that's the nature of the game.
Overall, Noita is an amazing game with an incredible amount of depth. 
It will punish you over and over, but you'll keep coming back for more.

With a few hundred hours and some luck, you too can become a teleporting god of death, turn yourself into a sheep, and die.

I will one day give this game a more detailed review, but for now:
If you are a hardcore gamer, you will enjoy Noita. It is a punishing game that rewards experimentation, and rewards experience with satisfying dominance over its world.
However - even when you get the right set of tools in a randomized run - you are still vulnerable. Your death is always one drop of liquid away. It keeps you on your feet, and it keeps your adrenaline pumping.
This game is extremely tough and unforgiving. It is TRIVIAL to die, which resets your run. This can be frustrating.
This IS frustrating. But that's part of playing a hardcore roguelike.
This game features extremely deep "engineering" mechanics which are directly tied to your success in it.
This is a game where you try out a new thing - and probably die as a result. But this time, you know a bit more; and as you learn more and more, suddenly the mechanic that killed you will "click" and boom - you know how to make a magic wand that is more akin to "Tsar Bomba" than "Avada Kedavra".
The game world is absolutely laden with secrets and hidden mechanics. Some of them are almost impossible to figure out on your own, though. But most are totally "discoverable".
My only gripe with this game is that there is a "mid game" in your player development in which you are good enough to be comfortable with the game, but not good enough to really turn ANY run into a "win" run (in which you can discover secrets, IMO the primary goal of this game).
In this mid-game, you'll find yourself not random-rolling the "right" tools that you want, meaning you get frustrating periods of being stuck at the starter levels with "meh" equipment. It's not that fun.
But when you get the right tools.. ohhhhhhhh man. It makes it all worth it - even if you immediately die... because for one moment - you were the GRIM REAPER of Noita. Death Incarnate. The apex predator.
As you get better with the game, you find that the game gives you the "right tools" more and more often... because they were (almost) always there. Right under your nose - but you were not experienced enough to see it.
Sometimes you just get awful runs though, that are only "viable" for the really, really experienced players.
TL;DR:
This is a game about exploration and science. I personally felt like a toddler again while playing this: experimenting, exploring the world for the first time, and eventually - much more powerful than I really was. It's thrilling.
Also this game is completely whimsical. It's art-style and theme is beautiful, curious, and entertaining at all levels.
A number rating doesn't do this game justice. Maybe 8/10 because of the "balance" problems of the "mid game", but not in a traditional sense. This is a GOOD game. This is a SPECIAL game. It is unique and a ton of fun; a breathe of fresh air.
But man, it can be frustrating sometimes. But that's part of the appeal.
The only part of the game that I think is outright bad is the randomized starting loadouts. For reasons that will become clear, not starting the game with "water" (or an analog) is just an outright hindrance, and manifests as needing to find a source of water ASAP. It's not fun. You can probably fix that with a mod relatively trivially; but I haven't, because I bet one day I'll figure out how to use all the starting "potions" to my advantage.

Got my first win after 231 deaths and 50 hours. I can now recommend the game.

In the post-death statistics page, the game informs you of what caused your death. Feel free to ignore that though, because what really killed you was hubris.
It's always hubris.

I had attained Godhood. My sparkbolts dealt tens of thousands of damage. I was immune to almost all damage. Then I shot something I hadn't seen before, it exploded, and I instantly died.
Another time I was immune to almost all damage, including explosions! I had a wand that shot infinitely quickly. I unloaded on an enemy I had not seen before and died instantly as it shot back every time it was hit.
There is no pain quite like falling from hubris in Noita. This is the definition of not for everyone. But for some of us, this game is a masterpiece.