I really like the chord production in Waltz of the Waves, it feels super unique and reminds me a bit of the Wonder Egg Priority Soundtrack. Battle in the Depths was cool, I feel like the glitchy percussion didn't sit perfectly in the mix compared to the other sounds tho, this could maybe be fixed with a reverb bus to blend the elements together or making the glitchy percussion a little less mono sounding with some panning and more effects. I also felt the percussion, the clave in particular, in Siren's Call could be turned down a little (this is very nitpicky).
Regardless this is still a great OST with solid composition all around and I really enjoyed listening to it! Great work!
(after writing this I just saw that this is your first time doing something like this and that makes this even more impressive!)
Viewing post in Nagisa: Princess of the Sea jam comments
I'll have to check out the Wonder Egg Priority soundtrack at some point (and the anime too, that one has been on the backburner for a while lol)
And yeah mixing is one of my weaker points, so I plan on improving that. I knew that clave was way too loud but the time I realized it it was too late haha
Thanks for your feedback!