One word: Hot.
The ambient whale sounds are timed and executed very well throughout. I like the light and kinda floating feeling created by the drums, it adds more depth to the underwater setting of the song. The drums fills, kicks, etc. are good (I pay a lot of attention to them). I'm fond of the drum progression and additive complexity, particularly the changed around 1:46. The following synth that is introduced around 2:01 fits well, imho, as do the rest of them for that matter. I like the section at 2:31 in contrast to its earlier rendition. The addition of the new drum sequences is a nice compliment for it. The introduction of the toms adds another layer of nature to the song, I think, and fits well.
I can't really find anything I don't like, not that that's surprising. Pwned.