This is quite a ride. The power that the player can change direction of the dash is great! I wish, we did it the same way. The time slow down on it could be a bit stronger and the character could leave a trail like a comet or something. I smiled when discovered the double jump AND the dash gets you to places unreachable.
The level design is ok, but there are some places where it looks like the character could get trough but can't. So it needs a bit more polish. (As does a lot of games - like ours - on these jams)