Honestly, I think it's a really cool idea you have going on, but in my opinion the on-boarding process needs to be a little bit smoother as in maybe a tutorial, and the start needs to have a grace period as it's hard to get my bearings before getting thrown into the game. With the shield mechanic maybe it could be a shield and an health bar, when you get shot maybe an indicator that you've been shot as in maybe the shield breaks or the shield protects, maybe the shield could regenerate but your health doesn't. With space there is no friction right, so I think it would be cool if the spaceship kept moving in the same direction until it slows down eventually kinda like ice but momentum reduced by a lot for playability so that the player isn't rage quitting half the time. Also curious, is this more of a pilot to test out the mechanics, or are you planning to take it all the way to a full game?