Bug Reporting Time
While in a song in either Story or Quick-Groove mode you can quit through the menus but still maintain control of your inputs. This is apparent by spamming the accept key (S for me) on quit and seeing animations play out behind the menus,
This can lead to you being able to press quit then pressing left and up to press the accept key on Resume and THEN pressing pause again which leads to the game turning full black screen and locking all inputs. Forcing you to either alt+f4 or open task manager for the game. This is 100% replicable during any song.