I really like the graphics, the pixelarts are very nice, but as you have already said, the game-mechanics don't quite work yet. You speed up while breaking and the enemies don't really harm you. But it feels like a very solid game, which could be extended to a very nice game! Keep working on it, it seems like you are a skilled gamedeveloper!
If you want, you can check out our entry "Between the Worlds" too, would be cool!