Map can't be approved as melee because you missed few things:
1st. Item drops must be fixed (example only 1 creep near starting location drop item, to make it worse - Artifact)
2nd. Map isn't symmetric, if we look at blue player he will be able to defent from ground attack easily, he can destroy trees between 2 closest gold mines and make strong base there, more harder for red to do so, impossible for teal! Also teal is connected to them both, but read and blue don't...
3th. Terrain is average, but it must be improved, add more doodads, use rise and lower tool more! Tiles could be improved as well!