There exists at least one major glitch in the game. In any given area, if you open your inventory then pause the game while still in the inventory and choose another save file, the objects you can interact with in the new area will revert to the ones of the area you were previously in. It is possible to obtain unlimited health, find the Beast Fang, and even teleport back to the side room in the original Egg Corridor, with the Corridor still fully accessible using this.