If this was a phone game I would definitely pay 1-2 bucks for it. Pretty fun all around, my only complaint is that the color-swapping would hurt my eyes a bit. The level design was constantly interesting and it always seemed like I was learning something new.
By the way I noticed you're using Unity, did you know you can build the game using HTML5 WebGL? You have to download a free plugin but it all works through the Unity editor. I feel like your game would get more views if people didn't have to download it.