i think instead of just drawing pixels on the screen, it could use a line2d that appends the mouse position to the points instead so it draws inbetween each mouse position, i definitely found that made it alot harder (might be harder to set up though; i don't know how you set up the score and all that, so maybe that wouldnt be doable)
honestly beyond that the game has such a nice charm to it, enjoyed it alot