This really is a most excellent platformer, you know, even though I fear I’m missing out on some totally riveting storyline with the amount of Japanese dialogue going on.
Progressed past World 4, killing the Ice/Fire Dragon boss at the end that was somewhat heat bi-polar, and now I’m into Tree Tops World (World 5). Yes, a starfish in the trees, which are conveniently full of water and stuff. I’ve gained the ability to double-jump now too.
I did have a few bizarre “smack four things in order” puzzles to contend with, and no idea which order to smack them. Managed two by trial and error, and my wife solved the third one for me.