Great overall concept with a charming presentation. I don't think I quite understood the sleep mechanic (wasn't able to get all three characters to do it), so I wasn't able to advance very far - the game might benefit from some contextual tutorials (e.g. giving you prompts on what to do during certain gameplay states). Also, an idea to make the character switching more intuitive could be to allow every enemy type to spawn regardless of who you're playing (instead of hiding the threats) so it's more obvious that the player needs to constantly switch back and forth to deal with them all (not sure if this is a mechanic you included in later stages, so apologies if so). Overall, a very solid foundation that's well worth fleshing out further :) Nice job.