It starts off easy - just some silly stuff like The Day Today, then it throws in some Papers Please, then some Five Nights at Freddies, then Monty Python, then V for Vendetta. Watch a Let's Play - decide for yourself - if you like Scarfolk or SCP, this is the game you've been waiting for.
I'll accept Goldeneye as an also ran. Why is it so good? Sheer colour, interaction and variety. The AI is good enough that professional players will have trouble keeping up - but stupid enough that they'll run blindly into a pile of grenades. The guns are all useful in their own fashion - from the Pulse Bolts in Low Gravity to the devastation of the Flak Cannon, to the chittering of the Minigun. The sheer variety of maps and styles is unsurpassed. Two battletanks, a pirate ship, a warehouse, two facing towers...all there and in the SP as well. The nuke, Ordering NPCS around. NPCs with personalities. Designing NPCs to act like your stupid brother and then killing a team of him. Bright, colourful, cheerful, fast, frantic, with beautiful sound and music. What John Romero dreams about. "I'm sorry, did I blow your head apart?" Cons: A little too cramped at times. Top level AI cheats like a cheaty thing.