I think there is a cool idea here. A game where you need to move fast to maintain energy and speed is a good one. However I found this extremely difficult to play. I could not get past the first level. I assume that the energy you have is tracked internally and that jumps etc move the bar down? The bar in game doesn't move its either full on or off which makes it very difficult to tell. It seems random when you lose speed which kept running me into the top left enemy. I think this would be much better if you communicated the status of your energy to the player and made it more clear what actions drain the bar and by how much. But keep at it I think the idea isn't bad.