I am not sure how to use the "Y" ability. It sends me down through the ground until I either hit bedrock or fall into a cave. Am I supposed to hold the spacebar so that I don't fall? Is there anything else I should know?

Secondly, when zipped inside of an entity, several actions can cause your game to crash, like opening your inventory or starting a punch barrage.

Thirdly, the "Z" key doesn't do anything - or maybe I just don't know how to use it. If I am facing a wall, nothing happens. If I am in the air nothing happens. It is meant to zip me through a wall, but it doesn't seem to do anything.

I'm not sure but for the ability Y I think it's inspired by the scene where Sticky Finger anf bucciarati are fighting the stand named "sanctuairy". The ability allow you to move through the block under you. And if you press Y you will go up, but if a cave is above you, you will go up and stop in the cave (i'm not english.... so sorry for my orthographic fault) . And for the Z, sorry but I have the same question I don't know how to use it