So this game on steam is sort of like the Pirates! series. You have a boat, you sail around, do missions, attack other boats, buy bigger boats.
Currently I don't like the fighting style as much as I did the Pirates! games. It's more simplified, wind and such don't seem to matter, and you can't capture boats instead of sinking them as far as I can tell. It's early access though, so I'm hoping it will change.
I do enjoy the trading and questing much more than the Sid Meier's games however, and obviously the graphics are better. It's nice to have some real commerce.
It is multiplayer, and if any of you are interested in picking it up, I'd like to give it a go.