Colbert Bump: Markiplier playing the prototype is probably responsible for the massive success of the kickstarter. NerdCubed also played the prototype, so chances are he's also a contributing factor. The game itself also gave a bump to Republika's "Psy Pawłowa" as it is the end credits theme.
Development Gag: The AD2013 challenge mode makes the game resemble its prototype more, e.g. enemies don't look crystalline and wear sunglasses, the environment is more gray than white, and punches kill in one hit.
The friend talked to in the full release went through the 2013 version and the Beta version released to backers - he says he fought a CEO and wound up in a prison that was letting both guards and prisoners run amok, which is what happens in both versions.
Feelies: An unusual digital-only example. The game's menu interface is a DOS-inspired OS, and the entire file structure works, allowing you to dig around in your (character's) computer. Culminates in a rather creepy video labeled "rsm.avi" promoting another of the developers' games.
Samus Is a Girl: According to the art book, the protagonist from the first PC game/the Addict from Mind Control Delete is female. this doesn't show in-game though, as all characters are represented by androgynous crystal blob people
The Beta version features a Prison level where you were required to release all the prisoners for one big brawl.
Trailers for the Beta version included a setpiece where you're tied to an execution post by a chain attached to your neck. You would have needed to trick the executioner into shooting the chain to set yourself free.
Blog posts had the return of the mysterious suited man who tells you "you have served me well" in the AD2013 version, but the final footage is not in the game.
is probably responsible for the massive success of the kickstarter. NerdCubed also played the prototype, so chances are he's also a contributing factor. The game itself also gave a bump to Republika's "Psy Pawłowa" as it is the end credits theme.