I'm so dumb.... I meant room 5 not room 4.... -_-
Also I just tried lvl 5 again to see if a sleep would help and I still can't figure it out :( I try every door against every edge but I can't find another room apart from the 2 you start in.
Also I don't know why I didn't mention how cool the music is I love it! ^^ the sprites bopping in-between levels is so cute