This is a good puzzle game. It's so satisfying to watch the tiles fall into oblivion! I love the cube changing color effect! I think the difficulty curve is perfect. It takes me a few tries to beat each level, yet it's not too ridiculously hard! One criticism I have is how you can't move while your color is changing. It interrupts the flow of solving the puzzle super swiftly. I have the same complaint about not being able to step on the exit until the animation is done. I think the easiest solution to the problem is to make the animations much quicker. Also a step back button would be nice.
Good work, you should be proud!