My friend said it was the Konami code. You're talking about the floating eye in the sky after the dev joins the game, right?
I put the konami code in the game after you get booted out and reboot the game. You hear a victorious "doo doo!" and the game starts over. Not sure if there's anything else, but there's probably something if you replay it again.
Edit: On the blue screen when there are 0 servers showing input up, up, down, down, left, right, left, right, b, a, enter.
Edit 2: You're supposed to shoot the eye to get the special video to play.
I think it is, its simple to figure out what he wrote, just mimic his hand movements yourself on a sheet of paper, theres no mistake, its 1 M W or 111 vv, for some reason he wrote W little lower than the M, like, they are not in the same alignment.
Its enter key because of its shape and arrow inside(what else could it possibly be?).
I tried typing it in few places but so far no luck, I am starting to think this is where it ends, he did not implement next part in yet.
My bet is we will see updates soon.
-exit the server when he tells you to first time
-go back to server, do it all again and then when he tells you "you again go away leave us alone" along those lines, it will say he joined as spectator, then go to "room" on the left, its the one next to where you spawn and eye will be up in air on the right side when looking towards horizon
here you go! the room next to the one that has the blue flag in it, to the left of where you are when the "behind you" prompt shows up
this is likely because they aren't letters, they are arrows.
*** SPOILERS ***
And I can confirm that as of 11/12/19 that the only thing this game recognizes outside of selecting a server is the Konami Code. Anything else just triggers the key pressed sound while in the server list, and there is nothing inside the FPS part of the game that detects any kind of special code input.
You can not even load a terminal or anything to do the things the developer says to do to "load" the 100% save file, nor is there any code that looks for any kind of parsed codes (like a terminal *would* have to check for valid entries)
The "artist" *clearly* draws the arrow that is commonly used to demonstrate a Carriage Return (which is where the Enter key gets its other name: Return key)... its the clearest part of the whole thing.
Found this pretty easy, this is the exact shape they draw at the very end: https://commons.wikimedia.org/wiki/File:Oxygen480-actions-key-enter.svg
No. The Konami code IS programmed into the game, and its way longer than 5 symbols, and you don't press Enter in this iteration. The image is hard to see, but I guarantee its /\ /\ /\ \/ \/ Enter or /\ M W Enter. The pencil never crosses the first /\ to make an A, so I am 99% sure its the former, which would likely stand for up up up down down enter. The Konami code, by contrast , is up up down down left right left right B A for this iteration of it.
https://en.wikipedia.org/wiki/Konami_Code