First off, I love playing the game, even if I find some things cheesy. When you start, you feel like you're living in one of Primitive Technology's videos, and you're literally trying to survive by your wit and crafting skills, but I feel that there are some changes/developments that could make a better impact than others.
I'd like to see more rustic versions of many of the modern models like the grill and the sawbench. The sawbench, for example could more resemble an electricity-free log splitter and still perform the same job (maybe calling it a "primitive woodmill" or "primitive sawmill".) That nice sawblade and table with perpendicular corners breaks the immersion a bit, but I guess that's more a nitpick but it would give a better survival feel because that's the initial feeling when you start the game.
I'm sure a taming mechanic and a breeding mechanic is a popular demand, but it is something that would help move the game along. I'm not sure about the models. Seeing farm animals in Minecraft isn't as offputting as seeing them wandering around the landscape in this game, but I feel that animals are certainly necessary. I'm not sure what to say, so I'll see if I can't find the words later. There aren't any cave monsters. In many ways I'm glad because outside of gravity or a jaguar falling into the same hole as you, you're totally safe when hiding in a cave.
While swords are an iconic weapon, spears are more effective for hunting outside of a bow, so I'd like to see it added. It could give a player reach so they aren't as likely to get damaged, as well it's faster than a sword Maybe we could tone down the damage to balance it? This happens in real life as well. Shields might also be nice, not just as a piece of armor, but also a decoration. Perhaps later on we could have banners and a place to introduce our own graphics?
More vegetables, cooked versions (like potatoes, you can eat them raw, but they're so much more satisfying when they've been heated for long enough) and maybe a stew pot for fancier recipes. And something for pumpkins outside of a Jack o'Lantern. It's a squash, so it could have an effect similar to a potato when cooked.
More water and stuff to do with it. I see we have lakes on rare occasions, but no rivers, so if we could have some development to have more water bodies, I feel it would be something to help realize the world a bit better. And maybe we could have stuff like buckets filling if we leave them placed out in the rain.
Several objects have no "remove/harvest capability" If we can't recover the primitive furnace in its entirety, then being able to recover at least some of the stone would be great (I know it's a popular suggestion, so I'm going to add a voice here.) Also, having a construction animation for crafted objects might add to the survival feel. Just as an example, the campfire could have stones placed individually and the logs added while it's being constructed.
That's my wishlist for now. Red, you and your team have done a great job so far in breaking a survival/crafting world out of cubes and squares. Keep up with the excellent work.