Thanks for the wonderful feedback! I've been meaning to get back to this to touch it up eventually. I think your notes for improvement are spot on.
Stress and Stun Damage
I tend to imagine Stun damage as coming from things meant more to debilitate than to injure if that makes sense? My go-to in a modern setting would be a Taser. Although it's not so simple in real life, in narratives it's generally seen as a method to stop someone moving without hurting them. Ice magic or even a net might be used to inflict Stun damage as well.
Stress damage would usually come from things like magic or in the world of Tunic Miasma would likely have some connection to Stress damage. Liminal Horror (where I got Stress damage from) has a nice breakdown of the concept here.
Curses
As far as the missing curses...I may have just forgotten to come up with any... That same link in the above paragraph goes over "Fallout" which is the Liminal Horror equivalent to a Curse, however, those are more geared toward a specific genre of urban sci-fi/fantasy horror.
I also came up with some curses for another similar system of mine called Ouroboros and Ouroboros but those are mainly designed for that game's unique death-cycle system and I'm still not happy with them. They're the least playtested part of it.
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Hope that helps and if I do find time to take another crack at this game, I'll keep all this in mind! I got Affinity Publisher recently so I might be able to take the graphic design further than Canva let me too. Let me know if you have any questions and I'd love to see anything you make in response to/for this system! Thanks again for the reply