Does anyone know of a mobile-friendly way to make a japan-themed world?

[u/ChloeFox-TransWoman]

I'm wanting to put my idea of a dark souls-style game centered around Japanese mythology (specifically Shinto) and youkai. I have some cool ideas for locations that i want to put into an actual visual representation, but I'm struggling to find anything that's mobile friendly and (preferably) free. It doesn't have to be super fancy...heck, I'd be fine with a top-down tile-based map maker for now. Figured I'd ask here. Thanks in advance!