Little bit of diving. Little bit of harpooning. Little bit of sushi restaurant.
It’s a loop. Identify what the restaurant needs, what your mission needs, and what the eco society wants you to collect. Make movie, move the story along, and obtain bracelets from the eco group. Use money to upgrade gear and buy accessories. Dive deeper, for longer, and take down bigger fish. Repeat.
The story and animation are icing on this cake.
That sounds really dull and repetitive and I play games that make excel spreadsheets look fun.