Well here's a screenshot of it running in window mode by hitting F11, same thing. This was the first time I've tried playing the game, never ran it before, so I don't know if older builds did this. As for my GPU, I'm running a RTX 3070, so I think I should be OK 😜
EDIT:
I just tried running that old DEMO you have on the page, I get a similar issue except that I see this character art in the middle of the screen. Do you have compatibility issues with AMD CPUs?