Tilesets used:
Buildings:
itch.io/s/122231/bui...
Biomes:
itch.io/s/129396/nat...

More 16x16 assets:
itch.io/s/133183/vec...

Tilesets used:

Buildings and Infrastructure:
vectoraith.itch.io/medieval-chi...

Vegetations, Terrains:
Upcoming [unreleased] update for Biome Tileset Pack D (vectoraith.itch.io/biome-tilese...)
But you can achieve similar result with Pack A too:
vectoraith.itch.io/biome-tilese...

Tilesets used:
vectoraith.itch.io/farming-sim-...
vectoraith.itch.io/biome-tilese... (grassland biome)

Sprites used:
vectoraith.itch.io/top-down-rpg...
vectoraith.itch.io/top-down-rpg...

Background/Parallax:
[Unreleased asset]

Tileset used:
vectoraith.itch.io/biome-tilese...

The tileset (not updated yet):
vectoraith.itch.io/biome-tilese...

Snowy terrain is too similar with Tundra biome? Don't worry, Tundra biome will get a VERY different Permafrost special terrain soon!

Asset used:
vectoraith.itch.io/biome-tilese...

Animal sprites are available as standalone pack in:
vectoraith.itch.io/wild-animals...

Tilesets used:
Biome:
vectoraith.itch.io/biome-tilese...
Buildings:
vectoraith.itch.io/traditional-...

Spritesets used:
People:
vectoraith.itch.io/top-down-rpg...

Fox:
vectoraith.itch.io/wild-animals...

Tileset used:
vectoraith.itch.io/vectoraiths-...

Spriteset used:
vectoraith.itch.io/top-down-rpg...