I'm looking for a game⁠⁠

I played the game around 2010-2011, the game was on disk.

the game was from 1st person, I played as a cannon that shot down spaceships in space, it was all on 1 planet, as far as I remember you could only move right and left. Improvements dropped from killed ships, and if you picked them up, the gun changed and improved, but if you were hit, the improvement disappeared