I've played Limbo first, it was OK but was too dark, thrilling and moody for me. But INSIDE i liked very much, for its flow, atmosphere, style and level design, puzzles, sounds and in some moments gave some laugh. I really recommend it, even if you're not into Limbo kind of darkness.
I missed it back in the day but now I played it and it absolutely blew my mind in general, how far ahead it was, with story, abilities, atmosphere, level design. I recommend to change movement keys before playing, defaults are a bit unusual, and if it is too hard - set difficulty to easy. This game is 10/10 for me.