The artwork was really nice and I liked the addition of the boombox for music. Gameplay was a bit slow for me, but I thought making all the combinations was really cool. I did find if I was holding something I would still be holding it when the level went to the next one (useful holding something like purple or rainbox). A couple times too I would drop the box on the ground rather than ship it off. I would just have to pick it up and drop it again, but it happened quite a bit to me.
Really cool game and well made, great job!