I'm looking for any (Windows) software that allows me to draw custom street maps. I'm not looking for something that displays existing maps from real places, but something that allows me to define my own map. Obviously this can be achieved through any graphics program however

I am wondering if there's a software which makes it almost drag-drop easy to create your own maps of visual quality to that of Open Street Maps, Google Maps, street directories etc.

Preferably an offline desktop app with attention on design rather than complex geospacial specifics.

Context: I want to make a detailed street map for a game I'm making.