while the concept is good hard to play if your left handed.
Edit: hope you going to fix it like having a way to switch the drawing section it kinda hard to see as well especially if your using a Cintiq or any other drawing table with screen with your arm basically blocking the view.
I think even on a regular table it feel unnatural to have the arm basically on the right side of large tablet while you have to focus a lot on the left side of the screen.
Still give you a 5 star rating since this idea is super niche (beside OSU!) and would be difficult to consider cases like left handed people and not everyone can afford a drawing tablet with a screen.