Doesn't seem so challenging. What I loved with the default Starcraft maps is that you don't have a lot of resources at your base and you have to go somewhere else to get them before someone else does it. Your map has pretty much all the resources you need right where you spawn, which removes the challenge.
Another thing I'd like to note is that there aren't any so-called "doodads" in the map, it just looks too plain. Try adding some of those.