Love the atmosphere created by the colors and soundscape. Even if there was nothing to do it would be enjoyable to just swim around and vibe.
Something odd I noticed playing the web version is that the caustics in the shallow water seemed to be freaking out and vibrating. The surface was also doing the same thing.
I also encountered framerate issues that seemed to potentially be related to asset streaming. Chugging/hitching occurred when moving, especially when dashing, but would go away after a few seconds of not moving typically. Not 100% sure if that's the only thing going on with the web build though.
Will try the downloadable version later.