It was visually overwhelming for me sometimes, a lot going on, lots of orbit rings showing up around your ship. Maybe the orbit rings could fade when they are close to your ship, or just generally be a bit less visible? I didn't notice any way to see how much health I had, other than going into the shop, which meant I was often on edge like the next shot might be my last. I generally forgot I could speed up the orbits, so I almost never used that. If your asteroids have an orbit that overlaps your ship, they actually bump into you; I think they should just go over/under/through you. The sound effects for an asteroid hitting the enemies are weak, the ones for actually destroying an enemy are good though.
I think it would be good to have different types of upgrades. I don't know what, just something different. 😉
It's cool that the asteroids are your weapons, a shield, and also your currency. It's an interesting idea. All the visuals were consistent. The boss enemy with the flamethrowers was cool. It was a fun game, I enjoyed it. I enjoyed playing to the end. I would have played more if it hadn't finished at level 10. 😁