Since I'm waiting for the next world, I took a look at Salem. There are many cool features that I would love to see in HnH. I'm not suggesting anything in particular.
Instanced Tutorial
Food Cravings (eat a specific dish for a stat boost)
Processing Planks (Carpenter Workbench, Sawbuck, Timberpile, Oiling Trough)
Stoves (indoor cooking place)
Bog Iron and Wilderness Smelter (primitive ore)
Tiered Crops and Fertilizer (Agriculture is so much more fun in Salem)
Exploration Events
Mineral Sifting
Stamp Mill (structure that crushes boulders)
Baking Tables (leavened dough recipes)
Piggy Bank and Coin Collecting
Pajamas (sleeping bonus)
Salvaging Structures
Darkness Creatures
Infectious Diseases
A Main Currency (silver)
Butterfly Conservatory (kinda like a Bee Skep but for trees)
Speciality Containers (Toolbox, Bookshelf, Fishbowl)
A Main Hub City with NPCs (with a safezone around it)
Horses that can swim
More Clothing Sets
Decorative Masks (can be studied)
Foraging Movements (slows but boosts your ability to see forageables)
More Fences
Brazziers (turrets that shoot at criminals)
Booby-trapped Chests