I love me an arcade-y space shooter, and I'd love it even more with some epic battle music to get me into the rhythm :).
I found the game a bit too difficult. I wasn't able to last more than a minute after multiple attempts. The time you're rewarded for capturing an enemy's life-force often didn't feel comparable to the time lost trying to shoot it down enough to capture them in the first place. So maybe that could be a place for tweaking.
Loved the lighting effects with the pixel art, and the enemy explosions felt very satisfying.