Thanks for the feedback! Small question- what's pixel-hunt? Some else also mentioned that.
The floorplan was supposed to hint you to the secret panel on the wall with the "3" plate, in case people didn't see it.
The fourth wheel I assume you've unlocked by pressing the numbered plates in order, but in case your game bugged I'll mention it here. After that you have to open the menu and it is revealed there. If you haven't noticed I put a somewhat large empty space in the menu box and that is where the wheel shows up. I was hoping to do some breaking the fourth wall stuff with this move but I guess it's not hinted well as a lot of people didn't get it either.
I'm glad you found it interesting! Thanks for giving my game a chance.