Thank you! It was ultimately unrelated to the Proton bit and more an issue of sandboxing with the launcher I picked. One game folder moved to the right location later and it runs! :)
I'd gone through the demo using Steam yesterday already, but it confirms I won't be strictly depending on Steam, which means I'm now ready to wait for the 12th °^°. I have an itch of sorts, one might say. Do they make potions for that? :3
Questions about the game:
- Is there a way to skip other than clicking madly? :)
- What is the intended resolution for the cleanest visuals? I ran at 1280x720 but it looked very much like a 1080p game being shrunk uncomfortably into 720p. Unless it's a quirk of my card / Proton.