I can only add to what people said before me: this feels great! I initially had problems with switching the color because I was moving with the arrow keys and to me it felt weird moving and switching with the same hand. For only two days of work you have nailed the movement really well and I did like the levels. Although in the last level I find it easier to just wall jump off of the left wall instead of going right. I think if you would add an interesting narrative to the finished project you could have something really good on your hands!