Consider reducing the screenview size, and adding the fullscreen button from Unity settings. The game is too large, I was missing the button. How is this a 20 second game? I think the gameplay lasts much more. The cutscenes and dialogues a fine, but the gameplay should be shorter, in theory.
Anyway, it's an interesting concept. However, it would be much more fun if the arrows would follow the rhythm of the music. Now they are just random, and it becomes pretty boring