@DrFinkelsteinFrom what I recall, the puzzles didn't make much of an impression on me. One of the things about Limbo and especially Inside is their puzzle design, and how I can remember some of those specific puzzles years later. I don't remember anything really standing out from Little Nightmares in that regard. It definitely had a great look/vibe to it. I think had it had some really genuine scary moments it might have made up for lacking as many memorable gameplay moments.
Though it's also fair to say that having played those Playdead games (and a few others like it) prior to playing Little Nightmares affected my impressions of the latter. With Limbo in particular there wasn't much else like it at the time and it kicked off an indie puzzle-platformer trend. I'm sure if I played it for the time now I wouldn't be as impressed by it as I was back in 2011.
It's just one of those games where I played it and liked it and can't really say that any aspect of it wasn't competently made, it just didn't stick with me for whatever reason.