This is currently work in progress, so uh yeah but this is what the game will be based on; you have to draw a line so the ball will roll to the goal. You can just play around with it for now. You can also press space to switch to eraser mode. (also there may be some glitches like how the ball might glitch into the bottom of the screen if you draw on top of the ball and it has no other place to go. this glitch will also cause some lag.
Thanks to @antiquark for how to Ball Physics. Go check out his stuff! (also I dont know if I'm gonna put an eraser in the finished game) Update from 8 months later: No, I'm not working on it anymore, I stopped working on a lot of projects, sorry