Wow this is something really innovative. Using window movement as control is a really cool concept and I don't think I've seen anything like this before. But as much as I like it, the control is really difficult to get a hand on. I can't really make some of the big jumps without the window sinking all the way below my task bar, and at that point I can't tell where the character is. I think all you need to do is do some tweaking in the acceleration numbers. Good work overall.