Way easier to control with a gamepad:
Left stick to move, left bumper to clear all enemy bullets. If you don't have one then it's wasd/arrows and spacebar.
The ability to clear bullets can be recharged by moving close to, but not touching, bullets. You will die in two hits, but health can be regained by dealing a large amount of damage to enemies (or completing a "stage").

Due to an overambitious initial idea and a poor sleep schedule, I didn't have time to implement any technology whatsoever.
Does have a boss fight, at least, but be wary of the anticlimax afterwards.
Also features: no music, dismal environmental design.