There seems to be an issue with the latest build (as of 26-09-2020) with the Overworld button inside the app (not the site). No matter how many times I press said button the app does not transfer me to the overworld map. If using the site, the button do function though.
I'm using the itch launcher on a PC to launch the program.
On further testing it would appear that it's Firefox blocking pop-ups that causes issues for the webpage version.