OK. Random movement like this is sort of annoying. Maybe find some way for different types of cells(?) to move differently? A tiny dose of AI wouldn't go unappreciated.
Far too easy, agreed. Also, why am I auto shooting? I realize that's the best strategy in these sorts of games...but I feel disconnected from the gameplay if all I'm doing is moving up and down while _someone else_ does the shooting for me...
If you'd followed up the cleverness of the path manipulation with a solid tower defense game, you'd have had something pretty good on your hands here. Instead, you've got a poorly executed clone with a nice gimmick.
It is a nice gimmick, though, I'll give you that.