This is one of the best games ever made!
The gameplay, the mechanics, the way it smoothly introduces new elements of play, guns and perks, it's just INSANE!
A lot of other game developers should study and at least attempt to copy some of these concepts, they bring fun and joy, and you never get bored throughout the entire 12+ hours playthrough.
The minigames and the hidden actions that you can discover (or not) throughout each cleverly designed themed level are funny and sometimes challenging.
And then of course you can replay it by playing the other character.
Whoever designed this is a genius, and the amount of love and creativity poured into this masterpiece is just stellar.
I would recommend this on top of a list with games you should play once in a lifetime, or at least go watch a "let's play" on YT.