Black Ice is a fun cyberpunk FPS game that is always getting improved. The developer really does iterative development well. You can expect frequent updates. You should also buy this game sooner than later, as the price grows as the content does!
Quarries of Scred is a fun arcade-like game that will end up surprising you. It costs almost nothing and is well worth it! I liked it so much I ended up making an unsolicited tileset for it, so you should at least check it out!