These mechanics were mostly unfinished, although built in from the start, we didn't really get to make them work. I think the new sprite that the current version (on gh) has actually allows crouhing and it works. It's all pretty cheesy right now, but we're planning to add a physics/collision engine to make collisions and jumping better.

The shared files aren't bundled, sorry. You have to install them with your package manager for now.. The list of needed libraries is in the description.