The game was showered with praise and GOTY awards when it came out but I never see it on any "favorite games" lists and shit. Like, you'd expect a game that aged extremely well, especially when compared to other games of its generation, to at least be mentioned from time to time but nothing.
What was the F-stop prototype?
A version of portal 2 where the player interacted with the environment with a camera that could store/copy objects and mess with perspective (the concept inspired Superliminal, which I heard is fine enough).
It would be a prequel, and some concepts were used in the final game (like Cave Johnson and the aesthetic of the abandoned Aperture sections, minus the decay).
I think what really bothers me is that Portal could be this cool testing ground for weird puzzle mechanics, like Half-Life is for tech stuff.