So, people said that on the second level, where there's a locked door you need to go through in order to escape (not trying to spoil anything), they can't find the key. Either it glitched out, or they didn't look enough. With that said, here's a fix!
Download is in the attachments (straight in the first post):
Frictionalgames.com
The door which you need the key for is removed, so you won't have issues with that. Enjoy! If any bugs occur, report 'em immediately!