First of all, I just wanted to say that " Don't let them in " and " Guns 'n' Stallions " were actually some of the first games I ever played on itch back when I was just starting out with gamedev. They were also part of the inspirations behind the art style I use in my games. I've always loved the crunchy 2.5D style that you use, and I think this game is also another wonderful example of that.
Everything about this game is pretty simple all things considered, but you've done it wonderfully. The presentation in general is wonderful. Everything about the game looks and sounds wonderful with a boatload of charm to boot. I love the presentation of the bears in general. They were admittedly kinda scary, but I have to say that the whole game did kinda have me laughing more than anything else in general. I also love how the bears moved and acted like quarterbacks in american football. I could never really tell for sure when they'd charge at me and it definitely kept me on my toes.
Speaking of presentation, I love the visual variety in the levels. Each biome definitely looked and felt the part. That said, I think the actual layouts of each level could've used a little more variety. The layouts that were present became a little too noticable after a while with how much they repeated, so much so that my brain kinda went into auto-pilot whenever I recognised one. Admittedly the bears still made things tense none the less, but I still think it's something worth noting.
Another thing worth noting is that I think the shed mechanics are somewhat underdeveloped. I get that the idea was to have players scrounge the shed looking for upgrades, but the problem is that I think the stamina upgrades really should've just been something you gain no matter what anyway. A lot of my deaths were because I got further into the game, but I still had very little stamina since the stamina upgrades didn't really spawn and so the large numbers of bears got me pretty easily. This might just be a skill issue, because you can definitely avoid bears even without stamina, but I think it's worth noting for the sake of balance.
The door upgrades also seemed kinda pointless imo. Mostly since the door is gonna come down quickly anyway because of the amount of bears that start chasing you as you get further into the game.
But all that aside, this is still a relentlessly fun and hilarious game. It always felt good to get near misses on the bears and mantle over logs. Great work on this overall.