Played your map against the Caliph, I like the vulnerable Oasis in the center, however I feel like the amount of resource in the corners more than make up for it.
Maybe playing against a human player would be different, but the amount of gold that can be earnt from the stone and iron makes the game far too easy.
Otherwise i think it is a good map, maybe just a "noob player" map.
If you wanted to change it up a little, you could easily reduce the amount of resources in the corners with some strategically placed rocks, or hills making less places quarries or mines could be built.
I have uploaded a recording of playing this map here: https://youtu.be/_iVvTHsN4dk