I like the idea that you have to use various states to complete each level. The difficult does seem to increase at a good rate, though playing multiple seesions really isn't an option, as is the same each time. Was tricky getting used to swapping between states too, so may have been worth further testing with other controls, or reducing the number of possible states? Otherwise, the animations were cool, and I was impressed you did it all by yourself!
As a side note, I had trouble starting to play, as I didn't realise it meant press 'Z' to start - I pressed '2', and tried 'S', and then tried just clicking around; got it eventually, but was kinda frustrating.