I’ll go first. In my opinion Ori and the Will of the Wisps does the water level just right. Luma Pools which is the water area/level does it just right where it’s not too frustrating, not too challenging but also super duper fun. And not to mention the area music is top tier too.
Subnautica. The whole game was built around the idea of exploring underwater and it really shows. Movement in the ocean is very smooth and feels great compared to movement on dry land, which feels very awkward, like you’re controlling a drone with a camera on top.