The clipping is just how the model is positioned when the player is in the air. I guess I could change it to snap to the ground whether its sloped or not, but it doesn't really matter. Might fix that in a later update if I have time.
Edit- I've updated the GitHub release with a fix for the slope problem; I haven't updated the demo yet but that should be included in the next build, whenever that is.
Anyway I've updated the download to fix the 2D problems as well as fix a few other things.
Also, I released the framework yesterday, but I haven't announced it officially outside of my Discord yet. You can download it here.