Hmm, This is going to be a tough decision.
here are some things that could be unbalanced...
The expansion near the tail of teal's main should be on the inside, not the outside. But it would be hard to move it without changing the mains.
And Purples gas/mineral expansion is so close to the cliff that it can protect it with cliffed tanks while it would be harder to being another player.
The middle patch of minerals is a huge risk to go for, and it wouldnt have too many ood benifits.
it has slow mineral income and is hard as hell to protect.
This map would be hard with 4 people. There would not be enough expansions, because 4 player games always take a long time. So this map would be bast with 2 people.
MAYBE you could take out two players and put each of the two start locations in the corners of the map, and make a ramp. Then you would need to make that bigger, and take out 2 of those hilled mains in the middle.
do understand? That is only if you want to take exteme measures. i wouldnt promise anything great. maybe you should try it and make a backup. or else i could just Dl the map and try it out. (you could still have credit)
ADDITION:
BTW, Millenium army, you have good skills at melee map making, I hope you continue with it and get better and better. I will be here to help with any map