There was once a arcade game called Pyrates or something which was a 3-d maze runner with a fantasy pyrate theme - including ship to ship battles, collecting gold and avoiding sea dragons. Each stage ended with a portal to the next stage/world.
I used it for my own vetsion of Not-Spelljammer called the "Medula Nexus" i
a shattered realm of archipelagos and churning sea-lanes where storm portals swirl and ancient ruins bleed forgotten magics.
Now, rogues, freebooters, rebels, and adventurers sail in spell-rigged galleons, bone-crafted barges, and aether ships trying to navigate the spell-lanes and ride the medula storms. Their lives are a balance of plunder, survival, and defiance against the powers who seek to relocate or reforge the Nexus Spire and bring all realms under their rule.
It was inspired by that game, Pirates of Darkwater, Spelljammer and a few other ideas.