OK SO WOW APPARENTLY THERE WAS A PROBLEM WITH THE BETA. You couldn't go through the final door because APPARENTLY RPG MAKER HAS A VERY SPECIFIC WAY THAT EVENTS ARE SET UP.
Please don't feel scared to tell me any bugs you happen to come across. But anyways, to anyone who didnt see beyond the door here's a screenshot.
You would basically go up some stairs and then end up here:
The sign is just a dev post saying thank you for playing the game and also to get excited for when the full game comes out. Also it says to replay the game again to test out new guns and items. anyways that's it sorry folks lol.