Sail Forth looks like a wonderful ocean adventure on the more chilled side of things (in a way), and if it's anything like the earlier versions I tried a while back, it would be an easy recommendation. Has quite a mixture of things from peaceful exploration and building up a fleet to various combat encounters too.
More about it: "After waking in the middle of the ocean with no memories, tie together debris to create a makeshift sailboat and figure out what the heck happened. Master semi-realistic wind sailing physics to chart unknown waters, welcome aboard stat-enhancing crewmates, and grow your flimsy dingy into a fully-fledged fleet throughout a charming heartfelt journey to save the world. Discover island environments and challenge landlubbers to a variety of mini games including boat racing, target shooting, card games, fishing, or photo collecting."
I absolutely adore the style!
Explore the Deepblue!
- Put the wind to your back and cast out into High Adventure over a vast ocean spanning dozens of eccentric regions.
- Discover countless isles bursting with their own flora, fauna, friendly folk, and fearsome foes.
- Playfully pursue a pod of curious dolphins, admire the beauty of the sun sinking into an icy horizon, or run down a clutch of cowardly criminals only to accept their apologies to the tune of wild cannonry.
Command a Sailing Fleet!
- Build and manage a custom cadre of specialized vessels to match any personality and play style.
- Buy, equip, upgrade, and modify your ships’ armaments to face off against the toughest privateers this side of the Eclipside.
- Crack open giant clams and loot lonely shipwrecks to fill your fleet’s treasure hoard and keep your crew in shipshape.
Available with Native Linux support on Steam.