so the soft lock happens if you press the interact button the grabbed cheese stays on the screen and you need to press shift or other keybind to make it dissapear or you get hit with overflow and get sent back to top floor.
For me the game seems to softlock if you press Quit Game in the pause menu. Also, there's some kind pf out of bounds glitch where if you try walking back from an area transition (namely the stairs in level 4) you walk out the room into a black void. Going back into the room seems to fix this tho.