We've uploaded new builds in the last 24 hours, hopefully there's a fix in there. In earnest, we can explore alternate keypresses to open the menu, and will do so at the very least to attempt to debug the issue. Though, Perceptoscopes are entered by pressing Z. There should be no key press required at all once exiting and returning to the gallery, you should just return to where you were with free movement. There was a fix for this specifically in the 1.1 update, just to say. I can not personally replicate the issue, but am keeping an eye on it.
To enter a Perceptoscope, you approach it and press Z. To exit, you use the ESC menu and select "Return to Gallery" - though, as reported, if you can't access ESC Menu, you won't be able to leave the Perceptoscope. As mentioned, we'll explore alternate inputs to exit Perceptoscopes outside of a menu, though, ideally, we'd have you able to access the menu in the first place!
