Awesome concept and really fun to play!

I would maybe add a charge attack.

Some feedback:

Homing missiles felt largely ineffective because they don't home fast enough or don't turn hard enough to actually hit the target, plus you could collide with your own missiles.

A ship with no thrusters has no real indicator of your thrust direction, making it difficult to determine which way your ship is flying (intentional?)

Seems like it could be a neat idea with a fair bit of polish.