I gotta hand it to you. I really appreciate there being a run button. The main characters are kinda cute in a surrealist way, too! The color blending concept has been done by other games, but you really make it work in 3D. I do wish there was sound, and I can agree about the pacing being a bit slow as others mentioned.
In my opinion, the game would flow best if the black character walking over the light floor tiles caused those tiles to turn black.