Peaceful, with a sweet underlying tension. I'm glad I played this!
Short review posted on Mastodon:
Resonance of the Ocean is a short digital adventure game in which you collect objects to create sounds matching what you hear from across the ocean. The graphics are handdrawn and look pleasing, the sounds are soothing, and there's a soft tension in the mystery of the sounds. It's a downloadable game for Windows and takes about 10-30 minutes to play.