Very slick! You even got an online leaderboard in here too?!! Wild! So polished for a game made in 72 hours.
Only thing I would say is that for how central (and fun) the dash is, its meter is at the top of the screen and is so small! If anything it should have the largest display size of the meters on the UI, or at least equivalent to the health? Maybe another solution would be to make the player sprite give a bit more of a clear tell for how much time there is left until the dash is ready?