Damn are you gonna release this hack's soundtrack in the music section? I need that song that plays in Yoshi's Island 3!! (is it an original composition btw?) I'm disappointed you only used a handful of songs for the vast number of levels there are, but I have to give credit to you for making custom P-switch/star songs as well. I'm also surprised you had the patience to make all these sound effects considering how fickle AMK is with them.
How'd you get those switch palace thingies to work? Sounds like it was probably a lot of pain to do especially since it saves their pressed state once you turn off the game. Please release them too!
The graphics are cute but I think they could use some work. A decent amount of them are pillow-shaded which is a big no, and some of them feel inconsistent with each other. You have a lot of space in the sprite palette rows so I'm surprised you didn't give more depth to some of the sprite graphics (like the Bob-Ombs). Don't be shy to ask for help in #graphics on the Discord.
Overall, this is a really cute hack despite its shortcomings, nice job!