I liked the music and the background art a lot. Really fun and high energy platformer, which fit the feeling of the Dash mechanic nicely.
I agree with some other commenters about obstacles being a little too hard to see, or they would spawn way to close for you to react when you got through the door. The other thing I would say is when you get a power up (or power down) it takes over the whole screen and it makes it even harder to see the obstacles.
Overall though, great submission. Good work. Good luck with the jam.
D