Neat idea. But I think the difficulty starts a bit too high, unfortunately I'm a small brain so I only beat levels 1,2, and 3 before I gave up but I think having easier levels to start with would be good for your game and place the levels your currently have to a later point in the game. The Undo/Redo mechanics are a really nice addition that really helps and the combination of Sokoban and Snake on level 5 is really interesting and makes for a pretty unique puzzle. But like I mentioned earlier it's way too difficult to just throw to new players and is a huge turn off. Build up your mechanics one at a time in a simple isolated setting and slowly ramp up the difficulty by combining the two. The idea itself is really cool so keep working it! Can't wait to see your next demo.