Great game. I really appreciate to start with a dummy enemy to get use to the controls and be able to select power ups for the arms (I recomment to reduce the health of the dummy if you restart, to not kill the flow of the game). As was mentioned in a previous comment, the roll is not instantly, that frustates the player.
If you have it, would be great to include a small description of each power up to help the player decide what it fits best his play style.
Great idea to include the controls on the floor, that's a great design decision.
Thanks for the game.