I say the game is pretty good, had alot of fun with it, reminds me of a early era DS game aha!
I think the main issue for me is the ball, it feels too bouncy for this type of game, and due to that if you draw the line inside the ball it goes wild aha, wish there was some check or way to slow down the ball or game itself? it'd be nice to manage the speed to some degree, and having to let go of the mouse before the line works is kinda painful, wish it was just draw but then maybe release makes it vanish? something like that would've worked better personally, but still I think you should expand on it! it has potential! good work :D