Thanks for the feedback. Sounds like you've really tapped into my wavelength with what I was trying to create here. A cosy little world, full of stuff to interact with, gentle puzzles, nothing too obscure, and all achieved via a retro style popup menu system.
The two issues that you mention would both be resolved in a finished version of the game. Function keys wouldn't be used to control options, and the control input would be redefinable.
Maybe one day I'll return to it. I put the demo out to gauge interest. It hasn't had much, but meh, I might just carry on with it anyway. I enjoy the creative process.
Just checked out your project screenshots on Twitter, that looks ace. It's got a very unique style. Good luck with it.