I love how the camera works! Combined with the background effects, it gives a great sensation of flying combats. (it might also be a factor in the "out of bound" glitch, that I eventually encountered as well)
The game mostly need feed-back effects (when ennemis are hit for example), as well as some sound-design (not surprisingly ^^'). Other than that it feels pretty great. The trance mechanics balances nicely the risks and rewards. And the controls are tight enough to allow frenetics fights. Basic, but enjoyable. Good work!