That is such a shame!
I think you and a friend of mine would have the same problem if you got stuck with a white screen. Since this is made in Godot 4.1 with Forward+ rendering, it is possible that either your graphics card or system does either not support Vulkan or it’s something related to Forward+.
I sent a copy to my friend with a weaker rendering pipeline and it works. Unfortunately, I can’t mess with the files during the duration of the rating period…
Thank you for telling me this! I thought this was a “unique to one person” case, but it’s good to know to take note of this ahead of time for my work in the future. Especially in game jams!