Platforming is not supposed to be tricky and the puzzles are really well designed and manageable (I usually look up puzzle solutions after a few minutes and never had the urge during Limbo or Inside).
Both look really cool, but I am really not a big platformer guy so I'm unsure. Inside is 90% off on GOG though so might pick it up for a dollar and a half. Limbo is full price and even though it's just $10 I don't know that I'd like it enough. How hard is the platforming and the puzzles?
they're not really platformers like, eg. Mario, they're a lot slower with the focus being on environmental puzzles (levers, boxes, elevators, avoiding obvious enemy sight etc), with the occasional escape sequences here and there. The puzzles aren't really any sort of headscratchers, basically "how do I get there? oh, I drop this box to break the floor here (telegraphed hard)"
If Little Nightmares -series is familiar, they're basically like that. While the puzzles aren't hard, they're generally timed to allow the obvious enemy to get close enough for the player to "pucker up" a bit and then flee the scene with a relief.
I really enjoyed them, but I wouldn't say there's any replayablility there. I enjoy the dark atmosphere and a lot of the fun for me was just the discovery and seeing what sort of creepy stuff coming next. Once the games were finished I didn't feel the urge to play them again.
Limbo is the archetypal "scared little guy in big scary world dark artsy platform-puzzle indy game". Personally I found it overrated. Nice enough art style, but nothing of substance - extremely basic gameplay, no plot. Just a series of scary monsters killing you until you trial-and-error your way to the next section.