I bought the asset package here on itch so I could apply it to UNITY, but the packages here come without the .unitypackage, you can make these ".unitypackage" files available along with the package. Thank you!
Thats right, as the description says these are not unity packages sold on itch, but instead the base spritesheets that you can use in any game engine(hence the lower price).
if you are specifically looking for the unity versions with example scene then you need to buy it from the asset store.
