I am assuming you may have gone past where the demo was meant to end as I didn't realize this upon adding an update fix to the game but I do know that I did accidentally make it so you could go past the intended end zone. But the game is supposed to end after you beat the first boss and the secret boss. Currently the only areas that are supposed to be available is the forest related ones and Slethero's den. Anything after that is supposed to be off limits for now as they weren't that close to being done after I released this demo. I hope that I answered the question but if I misread this comment then I apologize and will try to find the glitch!