This is a really cool concept, can be expended for example moving 3-4 parts insted of only 2. the gameplay is fluid but sometimes you can just leave the game without touching it and get alot of points.
As for the leaving the game running problem, I spent 45 minutes on that and just figured out all the ways I could break the game. and after that I didn't want or have the time to experiment with adding more moving parts.
