Infectonator : Survivors [Steam store page]
The game concept/design is solid - scavenge supplies, rebuild your base, try to rebuild the car to get out of town - but there are a couple fatal flaws that really hurt the gameplay.

The main one is the AI - it's dumb as a box of rocks, and will walk through toxic slime (which kills the character in a few seconds) without hesitation, even when there's an easy path around it. Most of my damage and deaths in this game were due to the AI making stupid decisions.

And when a character "dies", they can be revived for around 15 seconds - which is fine except that it takes like 7 seconds to actually revive them. The timer doesn't stop as you're reviving, which means that if you get to the character with 3 seconds left on their timer, there's no chance you can save them.

It makes it frustrating if you're in the middle of fighting zombies and can't start healing immediately. I'm sure there are upgrades to make heals faster, but it's still a flawed design.

I want to like this game, but while the graphics are gorgeous and the flying feels good, the content is lacking and inconsistent. The difficulty curve is polar opposites most of the time, either you're dominating the enemy or dying very quickly, and there's little to do besides pick up resources and shoot enemies.

The EVERSPACE - Encounters DLC pack sounds like it adds some actual mission content, but I haven't played that so I don't know if it's actually satisfying, and it's silly to be charged extra for what should have been part of the base game. Granted the game+dlc is $40, not $60 like AAA titles, but it also has a lot less content than one too.

I give them credit for the weapon design and feel though - each of the main ones is unique and feels powerful if used correctly. And although there are only three ship types they each play completely differently. It's just too bad they didn't add a decent variety of gameplay to go with them.

Just Get Through [Steam store page]
If you mash together the responsiveness of Super Meat Boy, and the randomness of Spelunky, you get a simple but satisfying randomized platformer.

Guild of Dungeoneering [Steam store page]
Some of the mechanics are unconventional, but once you learn how to play it properly it's a fun and well balanced dungeon crawler with a twist. It's one of the only rogue-like dungeon crawlers that I actually go back and replay from time to time.

Battlevoid: Harbinger [Steam store page]
Solid, though the ships aren't really balanced and you have to play/lose repeatedly to unlock new ships before you have any shot at winning.

The Binding of Isaac [Steam store page]
Decent mechanics but disgusting theme. Enemies can shoot diagonally, you can't. The bad hit-boxes on arrows are frustrating, making yours regularly miss enemies and allowing enemies to occasionally hit you through walls. Made with Flash, low res.