Having been such a fan of Limbo, and somehow finding out about this game barely on the same day it was released on PS4, I immediately purhcased it, and beat the game in one day, with my good friend Mary Jane.
While Limbo had incredible atmosphere and just an overall eerie vibe, this game was absolutely driven by its narrative. You are constantly in new situations, and have to think on your feet. What the game does right is not relying on overusing a puzzle mechanic. Having gone into the game blind, the first "mind control" puzzle made me think the game was going to be filled with it, but there were only a few, each one-upping the previous.
The 1984/Animal Farm vibes in the beginning were great, but all of the imagery of lab experimentation made the game and the deaths of your player more brutal. I fully expected a reveal at the end that someone was mind controlling the player with one of those caps, but got more than I was expecting with a dark version of "A boy and his blob".
Inside isn't perfect, some of the puzzles were a bit uninspired and at times ruined the flow of the kid escaping (at least in the first act). Also, the third act personally I loved, but at the same time it did somewhat undo the tension of the first 2 hours. Limbo left a bigger impression on me, even though it fell apart in the second half, but this game is definitely better if only because of how much content it has story-wise.