I suppose I've plugged it recently, but Another Crab's Treasure.
It opens pretty plainly as an ocean-based Soulslike parody with a simple story premise and some self-subverting humor in the dialog with other crabs. As you go on though, every 20th conversation becomes really pointed and real-world-connecting, going beyond just "pollution bad". It's not quite Spec Ops: The Line, but it at least has something to say about society.
The combat is frustrating but addictive, much like Souls games - and it's okay with handing off a number of allowances like accessibility modes and tip systems. It's even helpful that, if I die to a glitch or something bogus, I can actually just choose to re-obtain my microplastics (souls) through a menu.