The game idea is interesting! Is there any key to quickly switch between eraser and brush? Can the failure sound at least be muted because it's way gross. Also, is that really possible to pass level? Probably I am doing it wrong but I cannot pass even first level, does not matter how many times I tried. I believe first few levels should be way simple, to attract user and develop skills (better understand when what instrument should be used). All in all, good work!