Really great game. I like how you made the 3*c + Enter to skip the level. I also like the simple graphic and how well you included the theme into the game. I found one problem that was annoying, when the boxes were moving and a player was on top of them and the box started to move horizontally, the player wasn't moving with them, but it wasn't a big problem but more sort of something that you can thing of changing it. Over all, a really good game with really simple and enjoyable graphic.
If you have some time then you can try and play my game :)