YMMV / Call of the Sea

• That One Level: Chapter 5 is a fairly linear level whose main puzzle is very simple and involves a lot of backtracking. The last puzzle in the level isn't much better, relying very heavily on timing and trial-and-error. It doesn't help that Chapter 4 has some significant plot twists, better puzzles, and a trippy dream sequence, in addition to being much more open, making Chapter 5 feel more simplistic in comparison.
• That One Puzzle: Chapter 4, the mural puzzle. The easiest way to solve it is to simply brute-force the correct combination, that's how little all the elements relate to each other.