I like that you kept the game simple. And though it doesn't feel like a finished project, that is to be expected with game jam submissions. So I won't hold that against it.
The mechanic for dashing through enemies works pretty well. It makes the game more fun in that it's not just about avoiding enemies. I didn't figure it out before reading the comments, though.
For me, the difficulty went from being easy for a minute to suddenly being quite hard. Would have preferred a more gradual difficulty increase.