I just bought this (9/15/2020), and was unable to run it properly on GMS 2.3. It loads the room background and all the GUI, but no character or walls. Is there something I am doing wrong, or is this a bug caused by 2.3?
That is VERY unusual. I just imported the project into 2.3 and it worked great. And you are the first to report an issue like this. Try cleaning and re-building. If that doesn't work, I'd be interested in seeing your project file.
Looks like it was a problem on my end. My anti-virus was interrupting some GMS functionality. I've spoken with yoyogames and have resolved the issues. So now, this file runs GREAT! thanks again.