Subterrain

There are a lot of underrated indie gems out there that truly deserve more recognition and this is one such game. Subterrain is a sci fi horror top down shooter with survival elements. In my own interpretation, the game is set in a time where technological advancement has ushered a new era of interplanetary colonization namely mars, mining it for its rare minerals and scientists expanding new horizons of research and knowledge than ever before. Nanotechnology revolutionized manufacturing on an unprecedented scale and functions as one of the essential gameplay mechanics later on.
You start off in a mars prison cell as a Dr Albert West who was wrongfully convicted for the death of a colleague. Upon escape you realize the entire mars colony has been on lockdown. Dead bodies of colonists litter the facility and logs provide you with details to events prior to the xeno outbreak. The game has a dead space feel to it. You make your way to central control via tram and it serves as a bastion of safety, recuperation as well as daily operations for research and production.
By accessing the central control terminal, you can distribute power throughout different districts of the colony and travel there via tram. The reactor cores also located in central, sustained considerable damage and you'll learn how to repair and maintain them from the tutorial, install security turrets and eventually defend your base from mutant invasions. The modules' durability will decrease over time and affects the amount of power generated. The less power it generates overall, the less amount of sectors you can allocate power to, which factors in planning and decision making. Exceeding the maximum limit of power may result in a nuclear meltdown. Though the player can craft advanced core modules later on enough to power all sectors. A sector without power means that it doesn't have oxygen and thermal regulation.
You'll also learn the differences between global infection, rate of infection and regional spread. Infestations in some sectors can be so severe that you'll struggle to clear them without the use of more powerful weapons. Higher levels of research software enables crafting advanced iterations of standard weapons, armor and equipment, oxygen canisters with higher capacity and purification filters that rid an entire sector of infection, just to name a few. As Dr West, you play as a janitor, soldier, scientist and engineer all in one. Simply one of the most satisfying and addicting indie games I've ever played.

To the developers:
You've made a very good game, but it takes far, far too long to complete. It took over 50 hours of the 62 hour playtime to finish on normal, far too long given the limited variation in gameplay. If you ever make an enhanced sequel, please consider adding options for different gameplay lengths (i.e. a regular version which takes half as much time to play, along with an extended version).
More variation would be nice across the board. More enemy types, mission types, NPCs, weapons and environment types would all improve a sequel.
To potential buyers:
You'll probably like it and have fun, but you may not finish it. The gameplay is solid, focusing on a loop of explore / loot / fight -> return to base / recycle loot / get upgrades. There is some depth in the upgrade system, which involves sourcing chips to manufacture and research better versions of weapons / equipment / armour.
The survival mechanics include injuries, food, water, oxygen, heat and contamination. There's reactor you have to maintain and defend occasionally, and an infection mechanic. As infection in the different districts increases, more and more difficult enemies appear, but you can slow it down by killing enemies and placing upgraded oxygen and thermal filters. The boss fights (especially the final one) are VERY difficult.
Presentation is decent for an indie game. The story is minimal, but there are a number of quite funny logs to be found - these comic parts stand out much more than the main story, which has been done a thousand times already.

Just enough of what should be just enough to avoid annoyance (crafting, survival aspects), plenty of what should be always plenty (atmosphere, tension, feeling of progression). Simply put, it's brutally absorbing game.

Subterrain is top-down action game with a lot of downtime, and some crafting and upgrading elements. It's also technically a rogue-like with the option of permadeath, but the randomizing of levels doesn't seem significant enough that it would increase replayability much, except to avoid a bit of exploring if you are going for a specific item. I can't imagine the game would be fun with permadeath, as even with lots of equipment upgrades sometimes you can accidentally be surrounded and killed, and it's a LONG game, so getting all the way through with permadeath is likely only for the hardcore fans.
I like the game, though I'm not sure it would be to everyone's tastes. Difficulty ramps up in a way that you can control, which is the kind of thing I appreciate, but it's also a long game with the story being drip fed to you. Crafting and upgrading is a bit monotonous. You'll find yourself getting a chip upgrade, realize that it needs to be researched, then built, then installed, then you can build the first of level of a three-level tier of weapons, which then needs to be researched before you can get the next level. After building and researching all three levels, you finally get the last weapon of that tier and can start using it. That is, of course, assuming you got the chips for a) researching all this b) constructing that tier and c) mining to produce the elements to manufacture the weapon. There aren't very many tiers, so upgrading of weapons will feel like a huge milestone, but it will take several ingame days to do and requires multiple items from different maps to even begin to attempt. I feel like incremental increases where each chip allowed a smaller upgrade would be more fun.
Also, I like that it doesn't exactly hold your hand, requiring you to follow vague clues to find stuff or literally just search everywhere. However, while I did feel like a genius when I realized I could put a submachine gun in one of the defense turret slots that had been haunting me through the early game, the fact that my other guns wouldn't fit in and there wasn't a message informing me to try something else made it more of a guess than a working out of the rules of the game.
Still, it is a game where you do feel in control of your advancement and you can manage danger by preparing for things carefully, which is something that scratches an itch for me. A little bit more story and variety wouldn't have gone amiss, but the plot and atmosphere are nice.

While I'm not normally into horror games, Subterrain is a fantastic exception. Your ultimate goal is to escape the Martian colony which has well and truly gone to heck. You need to explore the now infested facilities, while keeping your supplies up and your needs met. Every choice has a consequence. Stay in your base to build up better gear, and the global infestation grows. Rush into infested areas, and you'll burn through supplies and equipment trying to survive.
Overall, a great game. I look forward to the announced sequel.

Its worth the money! :) if you like a race against the clock and crafting this is the game for you!
PROs: fast paced
crafting
worth it!
Cons: none.
Oh yea its a dark and zombie filled game so be prepared to jump :P

I have no earthly clue how this game ended up in my steam library but I am really glad it did, its got a really interesting premise and all the game mechanics feel really good,almost gives Dead Space 1 vibes which is a very very good thing