it's graphics are good, the little it has works properly
it's still too little to be called a demo, looks more like a prototype with graphics of a full game

you walk in a room, get some music notes, and that's it. even as a demo it doesn't demo anything about what the full game might be. you can't go through the door either even though it cracks open when you stand near it.
no sound either, in a supposedly music based game? cmon man

its okay i guess but there is literally nothing. you shouldn't post demos or unfinished stuff on newgrounds