Interesting premise, it's like asteroids but more intense. I really wish it were full screen, I clicked off the window a couple of times and the instant death mechanic felt unnecessarily harsh. The graphics were simple but charming in a funny kind of way.
There was a fair amount of "clunk" involved with the dashing, it didn't feel very smooth and it was easy to clip the very edge of an enemies hit box (either your hit box or theirs was larger than the sprite) and die. Shrinking the hitbox down would help a lot with the feeling of fairness. The sounds were cool, I liked the kinda honky tonk accordian sorta sound.
With some polish and tightening of the controls and graphics, this could be an interesting little game. Good job!