Appreciate you double-checking. The game seems fun by the way. I'll have to play a bit more of the demo, but enjoying it thus far.
What seems to happen here, is that the controller is not active in the main menu. If the mouse pointer isn't present I can't select an option there, so the menu appears to be 'dead'.
I'm wondering if it's something to do with having both mouse & controller active, or something with switching applications. To be fair, the mouse pointer on my 4K monitor can be a little difficult to see at times, but I've run into other games which tend to have the mouse disappear unless I tab to a different application and back. I tend to have multiple apps running, so it's conceivable something is amiss there.