non instant acceleration for the player would be nice, that way I could aim at things without running into them.
Also, the directional sound for the shoot sound is a little broken, right now, it spawns the audio player wherever you shoot, and the audio player doesn't move with the bullet, that works, but that combined with the aiming method mean that if you are aiming left, the shoot sound will come from the right, and vice versa, I would make the audio player a child of the bullet.
I like the music, and the animations.
The particles and sfx really add a lot.