I think the best way to approach Spiritfarer is as a somewhat cryptic expression if its core conceit: Thanklessly doing a bunch of repetitive chores for dying relatives who mostly act still like dicks towards you for your trouble, and bending over backwards to structure your time and living space around catering to them. The only reward for hard work is more work, and ever more specific and petulant demands. This inevitably evolves to all of your obligations piling up to the point that there literally aren't enough hours in the day and your progress in your own life (or your boat) grinds to a halt. And when they finally die you're stuck dealing with all their stuff, forever.

It's an interactive metaphor. And while hilarious when taken as a whole, perhaps from the perspective of it all being an elaborate troll, it actually makes for a kind of lousy video game.