Depending on the project, the app may not be able to figure out how to launch it, so it will just open the folder. If you can share the actual project I can take a look.
Viewing post in App won't start, redirects to folder
Sorry I am doing so many separate comments, but I am remembering things I should say in between them. I have been able to play this game in the past, and yesterday I was trying to update the game. It would say that it was updated, but still be the same game, so eventually I tried to manually uninstall the game (I did not know at the time that you could just right click the game and select uninstall, I found out right after though) and I think that is where I broke it. I am not sure how it stays broken though, because I have uninstalled and reinstalled both itch and the game.