when you pass a level, (or fail miserably) there should be an option of immediately going to the next level. like hit space bar to move on to next level, click here to return to main menu or something like that. it got frustrating having to click on the level i wanted every time. otherwise cool concept! 3-4/5 =D
I also think that there should be a way to get all of the items of of the ball, like when you finished the ball and you want to move on you could just click 'remove all items' and it would all disappear. i also agree with that there should be undo because i messed up a few times... otherwise... LOVED IT!!! :D