The art and name are iconic.
March of summers end has such a fun aura and was an excellent intro! I think it did the best at fitting the story of the game you were going for.
I think Fortify Beddy-Bye however was a little too long. It's pretty simplistic and as such felt like it overstayed its welcome. Having it be like a minute shorter would do wonders.
Rattle Royale also felt like it took slightly too long to really get going. I would have liked more of the goofy stuff like in the first song for the idea of a bunch of children protecting a blanket fort.