A fun little game. I tried the first 7-8 levels and the last one, and didn't discover any serious issues. I did notice that the "creatures" (that move across the map) look quite similar to the block you're trying to move out of the way, especially if the "creatures" are facing up or down. That can get a little confusing.
On the last level, there are 4 coins provided, but I managed to complete it only using 3. Not sure if that was intended or not.