Thank you for playing my game and for taking your time to write such a detailed feedback!
I agree with you on every point. I want to add more meaningful story, interactions and dialogues, because the game is a bit short at the moment.
I guess the movement is a bit unnatural without acceleration. And the double jump is a bug that is caused by incorrect coyote time calculation (I reused first-person controller from my previous game that was a platformer), I will disable it altogether. Head bobbing is something I would like to implement.
Definitely doing distance fog, I wanted to do it but just ran out of time.
I’ll look into area lights, Unity seems to support them but you have to bake them into lightmaps.
And yeah, that z-fighting issue on OpenGL version, I have no idea why it’s happening. I’ll try to move the objects further apart, maybe it will fix it. It’s a critical issue for me, since I’m a Linux player as well.