Really cool idea for the "board" to use an Escher's painting! But maybe you should mantain the camera in an isometric view, to not "break the original painting.
It could work really well as a strategy game if you work on it.
Nice work!
I once tried this, it's quite hard
Cool. What if you try using the Monument Valley's system?
I guess it would be fine, it's using the surface normal.
