Harbour Fishing starts with a small wooden boat tied up at a tiny island. Drag on the water to steer, or use the arrow keys. Sail into a dark patch and your net fills by itself while you stay over it - the deckhand turns to the rail and hauls it in over the side.
When the hold is full, a brass compass in the corner points the way home. Unload at the pier and the catch turns into coins, which buy a faster engine, a wider net, a bigger hold and a better harbour. The harbour is the part you watch grow: a second pier appears, crates of fish stack up along the quay, and the yard fills in.
A faster boat matters because the fish are sorted by distance. Sardines swim close to the island; mackerel, cod and tuna live further out, and a rare golden fish waits at the far edge of the map. Reaching them is the reason to upgrade rather than a number on a screen.
There is no fuel, no countdown and no way to lose. The hold is the only limit, so a round ends when a child decides it ends. Progress is saved in the browser, so closing the tab does not throw away a half-built harbour.
Like every Baboo game it runs directly in the browser with no ads, no accounts and no chat, on a phone, tablet or computer.