Is there no button that says "End of Chapter 3 - Shapeless"? How does the scene end for you?
That's very strange. It's been over half a year since that version of the game even existed. If you are downloading the game, the current file is called "MisplacedV6.2.zip", make sure that's the one you have. Have you tried playing in a browser? Also, are you trying to use an old safe file? If it's from before the release of chapter 4, it might just not work with the current version.