For something that advertises itself as an open world puzzle game, Isles of Sea & Sky unfortunately doesn't benefit from this design choice at all, much the opposite. People who expect non linear progression and free roam exploration like in Outer Wilds or The Witness are going to be sorely disappointed by this. The puzzle progression outside of individual islands is extremely linear, you unlock further islands and areas by unlocking all the main mechanics on the previous islands and through finding collectibles there. As the map expands, this gets extremely confusing. The map barely contains any information, travel between the islands is extremely slow, the island layouts themselves are poorly communicated and while there is only ever one way to actually progress the game, at any given moment there are loads of dead ends and inaccessible side challenges that distract from the "real" path forward.
What's worst about this is that you can access a lot of the puzzles that are gated behind mechanics you haven't unlocked yet, but the game never communicates this. As a result, you end up struggling with a puzzle for half an hour without knowing that YOU CAN'T EVEN BEAT IT YET because you lack one of the required mechanics. Puzzles with locked mechanics and ones you can beat without them are often mixed randomly, there is no way to tell at a glance which is which because engaging with the puzzles does usually take a while. Another extremely confusing aspect is that a single screen often contains multiple puzzles / collectibles, and many puzzle solutions feel mostly like trial and error to me because of how cluttered the screens are with objects that you may or may not have to use to solve individual puzzles.
While the puzzle layouts are often convoluted and confusing, I do like the actual mechanics. In smaller, better structured puzzles I'm sure they could have been quite enjoyable, but they really don't work all that well with the level design here.

谁要是觉得它不好玩，谁就没有脑子
谁要是给别人推荐它，谁就没有良心

Really great nes style puzzlevania full of creative and intuitive puzzles and exploration, gloriously free of unnecessary handholding. Can't recommend it enough for fans of Zelda-likes or puzzle adventures like The Witness.