After spending many hours completing both Six's and Kid's stories, I can safely say that I have reaped from Little Nightmares all that I can. I will start with the things I loved about the game: the creepy atmosphere ( I wouldn't call it a horror game), the clever puzzles, and the need to learn what is going on in the character's world.
I have not attempted the game on my PC, only the switch, but the controls seemed to be a bit fickle in my opinion. It was hard to tell if you just weren't getting the timing right in some instances, or if you were completely off on solving the puzzle. At times, the lingering on the edge of 2D/3D caused me to fall to my death from tall stair ways, or completely miss jumps from ledges. It was frustrating. Not to mention the load time of 20-25 seconds after you died (which happens a lot). It felt like I was really being punished.
Overall though, I loved the Tim Burton aesthetic of the game, and it kept me very engaged the entire time (which is awfully hard to do!). If you love creepy aesthetics, deep meanings, and solving puzzles this is the game for you!