Good potential, I would recommend making it clearer to the player how to progress, giving a win condition, and changing the upgrades, nothing but front & back cannon cooldown feels worthy or is not understandable from the description
I like the idea, but overall the flow feels too complex for how little it does, you end up dying from a cluster of enemies being spawned when you are not rotated properly and being pulled by a planet 100% of times, proc-s of planet actions never feel impactful, you just do it because you feel it is the only sensible thing to do to progress, even though it does not actually provide progress - upgrades are due to killed enemy's orbs...