Hmm, unfortunately they don't give a lot of detail. It might be because of Windows 11. The only three options I can think of are;
1. The download could have been corrupted somehow, so redownloading it might be worth a try
2. You haven't extracted/unzipped the downloaded folder or it somehow broke while extracting
3. Your computer antivirus is falsely blocking it
That's all I can think of, so I hope one of those might work for you. It is a very small game though, so it might not be worth the effort if you're spending a lot of time trying to get it to work 😅
Ok, no problem. I did check the antivirus, defender and Malwarebytes, and no blocking there. Also tried it with both disabled. I did download again but the same result. And yep, I unzipped and working with the exe file. At this point I have to agree, I will need to move on to other things :) If you do find a solution I would be interested in trying out your game.