Cool mushroom power. Art is excellent. The gameplay mechanics needed a bit more work - my character always face to the right, enemies get stuck moving to the left, and after the game over screen (I laughed at "you dead!" the ghosted-look followed me to the new game) maybe just focus on one feature at a time until they feel good during the next jam?
That said, I think you were *very* close to having all that working well, and it looks like a cool platformer. Great jam!