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...

I'm pretty sure RM XP use some kind of assets encryption by default. But you better use third party encryption for better protection (try searching "RPG Maker third party encryption"). And you can always edit the assets to your game needs, so it will look different than the original!

Tileset used (not including the royal family sprites):

vectoraith.itch.io/vectoraiths-...