One thing you could possibly try, see if you can load up a different game that's similar to this and see if it works fine, like VRChat or something like Sizebox which i think use the same engine/assets, see if it's just this game that is having issues or if other similar games are also failing to load properly.
Whats sizebox? Where do I download it?
I've tried opening Flattened HD, fail.
I've tried opening Sizebox. Success, takes a couple of seconds but that's the content I have.
White screen is really annoying and is a blue screen essentially
Edit: Should mention I've tried both multiple times, and that I've tried a lot of troubleshooting. Nothing works to fix Flattened for me.
Edit2: And I only remember now that the previous version of Flattened was a flawless open
Update on this, I had a download of Flattened.rar in an itch file, unpacked it and it was missing a file, something like resources.resS
I have no idea if it has something to do with the game on a white screen.
Something else too is that I uninstalled and then installed Flattened again, tried running it up again, and the screen was grey, but then white and... forever unusable.
Deja vu... nearly forgot to mention its only a data pack, no game
Ok I've played sizebox and it works just fine more or less