Hear me out, you guys.
What if, instead of treating it as a bug, we treat Valerie's blank gray void as a starting point for her stage? I suspect that a lot of folks, upon seeing it for the first time, thought of one of two things:
• "Hi! I'm a Mac." "And I'm a PC."
• Duck Amuck
In my case, the latter came to mind first, and it seems… kind of perfect, in its way? What if Valerie's stage actually got drawn and colored in as you played because, you know, artist? I mean, this is almost certainly going to be a bit too ambitious for an indie game with a fairly limited production budget, but it just feels like it would be just such a cool idea if pulled off properly.