Opposed to Dane's comment, I actually really like your presentation of the game. The simple and pleasing color design does well to highlight the puzzles as the central part of the game. I was a bit confused of what was going on initially, but once I figured it out, I was able to complete some levels!
Some minor improvements: I'd likely put some sort of arrows or dice sprite with the numbers on the right side of the screen. Also, in the future try to utilize music/sounds. I think they're central to a game's atmosphere and can really help keep the player drawn to the game, making the game have more dimensions.
Overall, I like your idea and the aesthetic really helped this game stand out. Great job on getting this game made in such a short amount of time!