itch.io

Yeah, that all looks totally fine. Is it possible the game is being launched in a location where it doesn't have read/write access? I'm trying to think what could be happening, but without any kind of error log it's difficult to debug :/ Celeste itself is a pretty simple .NET Framework 4.5 C# application, so it should at least launch and be able to make an error log of some kind. Sorry I don't have a better solution for you!