Not bad
Although the concept too ka few minutes to get used to as well. Another thing is if you are going to make the music speed up into a rhythm then have the character speed up as well to make it just as challenging and fun since it does not seem as fun when the music speeds up and you do not.
The game play was alright but hard to get used to at first and took a few minutes to get used to working with which was alright I suppose anyways. The audio used was pretty cool so nice choice in music I suppose. The background looked alright as well but would be cool if it changed to a light color of whatever color the character had changed to to make it intriguing.
Overall, good game, the only problem I ever encountered was sometimes I fell through even though I had changed to the right color.