It's very linear, but i wouldn't say it's boring, I like the level design and the atmosphere.
But if you're looking for an open world or labyrinth like levels, this is not like that.

The level design isn't the game's strongest suit for sure, but I don't view it as being actively negative save for one specific area for reasons other than boredom. It's linear, but fairly dynamic. I remember things about the levels.

The level design is unexceptional, but closer to good than bad. Encounter design and trap/obstacle/hazard placement are well-done... It's got logical shortcut placement and well-distributed pick-ups to offer 'tells' on where to find more obscure routes...

Wuchang is more involved, though it doesn't compare to Dark Souls or Bloodborne conceptually. It's just one of the only non-From Soulslikes that focuses on level navigation as a challenge/skill and feels meaningfully non-linear.

I do wish Lies of P leaned more into the belle epoch stuff. I get that it's been torn apart by puppets, but I wish it had more color and light and was less gray overall. The DLC is a step-up there, for sure.