Nice idea and graphics, but the music is annoying I'm glad you have an option to turn it off.
But I detect an asset from Unity asset store, the leafless tree from "LowPoly Trees and Rocks" pack by greyRoad Studio
https://assetstore.unity.com/packages/3d/vegetation/lowpoly-trees-and-rocks-8837...
Also some assets from the "Low Poly Pack" by Andrey Graphics like the cart on the mountain near the castle wall on witch the magic tower spawns
Low Poly Pack | 3D Environments | Unity Asset Store
Is it allowed to use ready assets? isn't it cheating or something? other devs spent days making their own art but you took a shortcut.