Hi there! I have a few thoughts:

• I couldn't figure out the controls beyond movement and jump. You could add a list in the description of the game. I think [F] does something, but I'm not sure what it is :D.
• About falling to death going beyond the corridor, you can set the "Kill Z" parameter in the "world" tab to any value you want (by default it's set to a very large negative number), or you could have a volume trigger of your own to handle death on your own terms.
• It would be nice to have a simple menu with the option to quit the game, rather than relying on ALT+F4

Hi there, your GitHub link returns a 404. Is it set to private? Please make it public.