Wow, what an amazing game! Right from the start, I'll tell you this felt like a complete experience already!
// SPOILER WARNING
The concept of the story is really cool, exploring and figuring out the puzzles is interesting, and it's all elevated by the weather and natural disaster phenomenons. Seeing that giant tsunami growing from the distance and the sheer scale of it makes encountering it in the beginning terrifying, and encountering it in the endgame still somewhat fear inducing. It was awesome to see it slowly approaching the land every time before taking cover!
The music is super nice, I loved it, and the fact that you used a musical cue to hint when things are gonna start going down was a super smart and very well appreciated move! When I heard the end of the calmer track, I was like "Waaait a minute, something's not right, is it?".
The one thing I'll point out is that I tried a few times putting the boulder in front of the library, but nothing would happen because the boulder would get its position reset even if I survived the tsunami. I'm not sure if completely intentional, but for a pretty long while I thought that wasn't the solution because it hadn't worked so many times.
The map and the annotations are a great touch and lets the player always get a reminder of where things are and what they found in these places, which also helps to keep track of the story being told.
I really enjoyed this game, this was great. Very well done!