This was asked on tumblr (might have been you), but it is stuck in the queue :D
I will copy what I wrote there even if that has not been published:
Now that you mention it, no there are basically no aquatic features.
There are already so many though that I will admit, I am not super enthusiastic about adding more. Already I have trouble with the ones that are in there and will probably forget to mention some in text.
Still, if enough people want some, I might be persuaded :D Though I make no promises about them not being quite ascetic only, if this is the case.
Though breathing under water..... Hmm... I will say I am not getting rid of MC's legs. But it seems I am overhauling the system anyway....