The best game I've played so far. Although really simple it makes you think. One thing I have to point out: it would be really useful to have all instructions written down somewhere so you don't have to remember or write them down by yourself. I understand that the first few levels have to teach you the mechanics but the last level is where it really shows potential. If you expand on this, add more features, drop the one line theme and add a unique twist that would make it standout somehow then I really think it could be a real game. Good work! (PS. The music was a bit annoying after a while but it didn't influence my rating).