Asked Calianna about her stuff:
http://pixanna.nl/products/ancient-dungeons-base-pack/
Hello,
Only my commercial tiles such as Futuristic Tiles, Rural Farm Tiles, the Ancient Dungeons sets, and the Fantastic Buildings sets, can all be used in any game engine that you'd like.
My free to use for non-commercial games however, can only be used in RPG Maker.
Hope that explains it!
Cheers,
Celianna
/Thats after you buy it.