Hello! Thank you kindly for the nice words!
Which graphics are you referring to? Characters and monsters all have 8 directional facings (up, down, left, right and diagonals). For the tiles its a bit more of a mixed bag depending - a lot of the building tiles have both, but certain ones are diagonal only. The vast majority of objects can be used in whatever orientation. Furniture is similar to building tiles in that some of it is diagonal only (this was stuff that I made at first before people requested I include 8 directions) and the rest has all 8 directions.
As for .obj files - there are none. Many of the tiles are drawn, and the characters and monsters and such are just 2D sprite renders. No 3D assets included.