We noticed the outer edges of your mapping examples here and the crystals have lights on them. I don't actually have RPG Maker MV installed anymore or I would check.
The lighting on the water and crystals, where is that from?
Viewing post in KR The Motherlode Cave & Mine Tileset for RPGs v2! comments
Great, glad it's working for you. The lighting effects are overlays. I don't know how it might work in Unity, but you could probably use some of the effects from the God Ray Kit.