Zolg

Zolg is a minimalist top-down shooter where you explore, fight enemies, collect powerups, and defeat bosses. Move and aim with WASD + mouse or you can use a controller. Controllers can be configured from the main menu. There are 5 powerup types to collect, 6 bosses to fight, and various other enemies and obstacles in your path. This game also has Steam trading cards and 40 achievements of varying difficulty to unlock.