This scratches an Asteroids itch and I like the open-universe approach. There's a little depth in predicting where and when the next enemy is going to pop on the screen and pushing away from the enemies so you can go back and approach them all from the same direction. I might suggest a little faster rotation speed for when enemies pop up behind you and knock you out before your ship can face them (or maybe that's just because I'm not moving around enough. Would love to see a non-endless version - maybe with waves of enemies?