Lazy Galaxy: Rebel Story is an interesting take on the shoot 'em up genre, as it mixes it up a little with you rescuing allies who join you in the fight.
Scrunk is a 2D online team-based building and raiding game that recently release with Linux support, it's surprisingly fun too and we have a few keys to give away.
Ravenfield is a pretty fun single-player FPS that keeps on expanding and becoming more interesting with each release. This latest release is especially fun.
Mr. Prepper is a game about opposing the government who have apparently started making people disappear who don't obey them, so naturally you have to build some sort of fallout shelter.
The first piece of expansion content will be released 2 August. Expect to get caught up in a different realm, the Beyond, and face new enemies and puzzles.