this is compelling. I think about the spirituality of limbo, because it's a personal, singular journey. I always felt that the game's constructions reflect more of the main character's subconscious, the character's hopes and unrealizations, more symbolic of the character's fears and anxieties. there's a feeling that your accomplishments are meaningless and all too late - at least that's how I interpret the looping of the end.
the title limbo coerces me into thinking this way. limbo's character left the world with anxieties about his environment and the fate of human, I think, with even nihilistic conclusions. limbo's protagonist doesn't believe in a single evil, and so, nature schemes against him, humans are against him, technology blocks and limits him. these things however stem from distrust, they're exaggerated in his limbo, they're antagonisms because the character in limbo couldn't make peace.
the final thoughts you present are cathartic, but, I believe limbo focuses only on liminality, and is even suspended in such a state. a man's concept of home is as situational as his fears and anxieties, ever shifting, and even being uncompromising. you come home and that home rejects you, only for the character to seek again. nature (especially the spider) outright rejects man, the natural man still needs dominion, whether or not that is escalated, and indeed it is as technology encroaches and overtakes the natural environment. maybe we do need to make communion with nature, maybe it was possible, but in limbo it didn't happen, and it couldn't happen.
I really like how much optimism you pulled from limbo. that the struggles aren't vanity, that we can learn from our mistakes. I don't get the same amount of optimism from the game, it's much too alienating, stressful, and destructive for me to believe limbo was embracing its ecological and anthropological aspects. yet, the undercurrent of progression was there all along, and frankly I missed it. I hope you keep writing about videogames, you have a perspective worth sharing!