Title Screen: The quiet piano helps set up the melody and main theme for your OST really well. The pads give an ocean vibe which is very relaxing to listen to.
Calm Area: This is really lovely watery guitar and piano over ocean pads. This track is the embodiment of gentle water exploration. I am bookmarking this track to reference back to when I want to write ambient water music in the future!
Urgent Mission: The piano and driving strings are very epic and sound like they belong in a Fire Emblem game. I think this is a really great chord progression - I especially love your bass movement. The electric guitar adds an intensity that feels like the stress of a combat situation. You were able to capture all of these feelings while having it feel like a water level throughout. This is an amazing track!
Overall: You have demonstrated your masterful ability to write in 3 different styles with what you have show-cased here. I feel that I learned a lot from you by listening to your tracks. Excellent work and thank you for sharing!