Developer: Michael Brough
Platform: PC, Mac (commercial version on iOS)
Zaga-33, made by Michael Brough, the same guy that made Vertex Dispenser, was originally a 7 day rougelike game made for the 7 day rougelike contest I imagine. It was so well received that it was expanded upon quite a bit. There's even an iOS version, that isn't free, but it's only .99 cents.
In it you are stranded on an Alien Planet, Zaga-33. Enemies on this planet are tough, real tough. It's best to avoid them altogether if possible. However there are some alien devices you may find lying around to help you defend yourself when needed, teleports, drones, spells, all that good stuff. These items are kind of sparse, so you want to hold on to them until they are absolutely needed.
The graphics are very retro. You play as an '@', however the enemies actually look like enemies, green blob things they are. Same goes for the items. The gameplay is what you would expect from a rougelike, the enemies move when you move if I recall correctly, and you use the numbers to use items. The music is pretty good as well. Very fun, punishing rougelike.