Nice little game! For a small visual feedback, I think it'd look nicer if the player's ship didn't have a while outline and instead had a visual representation of the shield (that maybe starts flickering when low hp), and for gameplay I think it would make it more interesting if ammo was limited and there were some asteroids that drops ammo and health pickups, I love the way the ship handles and having something to manage and having to make the decision between "do I shoot my way through for points or try and conserve ammo" would be cool I think. Loved it!