Cool take on a space invaders style game. I personally found it challenging to use the arrow keys as I'm used to WASD with my left hand and the arrow keys are on the right. I don't know if its because I'm so bad with the arrow keys or not but it felt difficult to properly strafe nearby enemies to charge up off them.
The sound FX were simple but fit the style well. The variation in enemy types was executed fairly well I feel.
Overall, a polished feeling entry.