Thanks for playing! I definitely want to keep working on it and try to make a full game out of it.
I'm not exactly sure but I did have trouble getting my loading screen to work with change_scene_to_file (works in editor but not on itch) so I ended up scratching it and just having the game scene be the only one. If it's an export issue see if your in compatibility mode and what your main scene is set as. Export project to an empty folder with index.html as the name. Zip-it - upload