[PC, Mac, Linux, Steam] Free: Bioprototype @ Steam

Bioprototype, a Roguelike & Skill Customizing Rhapsody! This is an auto-bomber with programming elements. Customize your character skills with visual programming, utilize enemy organs to finish the mutation, and construct the ultimate prototype, one can survive in the endless wave of flesh.

77 very positive reviews. Free to keep.

Bioprototype will return to Steam for free for 2 months (May 20–July 20). All players can add it to the library.

via Hiphopopotamus at OzBargain