Thanks for sharing your thoughts and feedback! Some of your suggestions are things we're discussion/working on, or that have been mentioned in the past by the community. I can't go into detail on everything just now, but I can share some information on a few of those topics:
We've definitely had a long-standing discussion or two here in the forums revolving around hibernation, which is a broader topic that usually encompasses the starvation mechanic you've mentioned. While we feel calorie consumption is fairly well balanced at the moment, the overall hibernation exploit is certainly something we're looking at more closely. More on that (and diseases) in the future.
Seasons have actually been a part of our long-term plan since the Kickstarter phase, so good news there! Depending on the reception of season one of the game (which is clearly 'Winter'), we'd love to continue to build The Long Dark into additional seasons. In terms of storytelling, each additional season would be a standalone sequel (think of the Telltale game model). Environmentally, each season would be a new time of year (spring, summer, fall) with its own set of challenges.
We've discussed - and continue to discuss - shelter building quite a bit. For now, you have a large amount of fully constructed shelters available on most of the maps, and those certainly offer more comforts and security than anything you could build yourself in a short amount of time. It could be useful in the future, but for now, there are other mechanics being worked on that we feel will add more meaning to your experience. It's definitely been noted that a few players have discussed this feature, so we won't forget the request!
Cannibalism is one feature we have no plans to add to the game.
There are more differences in Stalker than just the wolf population. I'll leave it up to you to determine those, or for other community members to share their feedback if they choose to do so. =)
I'd say Timberwolf Mountain is the closest thing we have to a "nature map" at the moment, with very limited options for man-made shelters. Have you made it there yet?
For the transition zones, I'm not exactly sure what you mean. Each transition zone we currently have is technically a smaller map (as you mentioned), and each certainly has a decent amount of unique terrain to explore.
Lastly, I see you're fairly new to the forums. Welcome, and thanks for joining us!