If i take a screenshot the split second it runs, I see errors that it fails to load resources. I dont understand why though, as it runs perfectly fine in the editor. Sorry if this question is annoying, I am new to Godot and this is a shared project.
Your project may have been corrupted. One easy thing to try is open the project, then close all scripts and scenes that are open. Then open them all up again and save them. This sometimes helps.