When I try to run Level 3 on Windows 10 x64 all I get is this screen with music playing in the background, no menu, etc.

Can you send me an email to powerthegrid@gmail.com?

I'll send you a new way to access Level3 while I try to sort this out. Sorry for the trouble.

same issue in mac os

I think it's a coding error, wait for the dev to patch it