RPPHS is a homebrew game by G333333 and MotoLegacy that’s similar to Geometry Wars (Geometry Wars 3 is available on the Vita). This top-down shooter is still a little rough around the edges but it still works pretty well. Feature-wise, it’s at the current state:
A good framerate while playing the game
Two different weapons which are a laser beam and bombs
Simple but nicely designed ‘enemies’ that you have to shot at