There's some wonderful unique art here. This really needs a bit of environment because as you fly around you can't really tell if you're even moving. The shooting does not feel very impacftul.
I don't think the scaling up as you shoot mechanic offers much in terms of being engaging gameplay. Sure it's a trade off in a way of "oh i cant just hold left click because i'll be easier to hit" but it's so easy to avoid that it's just not a problem.
The enemies seemed to not shoot at me if i was at a certain distance away from them, while i was still able to shoot them. That made the game very easy.
Anyway, well done!