What a fantastic idea! What really makes it come together is the omni-directional ship, I think. Had it been a more traditional rocket it might've been too unwieldy, but the lil cube ship makes enemies blastable from any direction, which is great. The number of times I just barely managed to take down an enemy before the last pixel disappeared from the screen. Sure, if they dropped a powerup it was gone, but the point is they didn't get away!
I will admit, sheepishly, to "running" against a screen border a handful of times to shred a clump of incoming enemies, though. That they didn't get out of the way means it's their fault!
A really solid little game.