Okay, I played the map and I certainly hope this is NOT the last version...
First of all you need to fix the AI. The first time I played I was 1v1v1 against an easy AI, just to check the difficulty. And I pwned them. Then I played 2 games 1v1v1v1 with normal and then - hard AI's. And I frigin pwned them! I mean... I play this the 3rd time in my life and I pwn hard comps??
The gap between the hard and insane comps is TOO F*CKING HUGE. 1v1 the insane comp raped my ass. There's no chances against him 1v1, and then again, the hard comp is pretty easy!
I think that the difficulty of the normal comp should be increased a TON. The hard comps should be somewhere between Hard/Insane and the Insane comps don't realy need the "This is Sparta!" line xD Maybe debuff them a little. They are too insane. You may also improve the easy AI a lot.
So now the easy AI should be somewhere in Normal-Hard. The normal AI should be a bit stronger than the hard ones. The hard ones should be between Hard/Insane and the insane ones should be a bit easyer. You don't need to create huge gaps between the comps. You need to create an AI that is good for Human Players.
A few other ideas about the AI:
How about creating 4 different strategies? Upon start, every AI get's one of those. The first strategy should be Melee only. The second one should be a lot of ranged creeps + mages. The other 2 should be mixed xD From what I've seen, most likely if I go to the observers and watch the 4 AI's fighting each other - then they'll never end.
Also - the AI almost doesn't do any upgrades
Upon end of the game one of the HARD AI's had 3 lvl armor, and another one had 1 lvl armor. I had everything at max! Even melee/caster upgrades, though I only used ranged units...
Other suggestions:
Team Battles. Oh yeah! I would REALY like to see a game mode like that. Like first you choose FFA or TEAM. Then if you chose TEAM, then you have 3 choises: Top vs Bottom, Left vs Right, or diagonal-wise.
Team Battles would be a nice addition to the game.
Also: The loading screen could use some extra description about the game for the newer players.
Like: Destroy the enemy gold mines to win (or leave them empty??). Or something for a good start like: Train your units in the tents and make upgrades in the gold mine. That would help a TON.
For now - I'm empty ^^
Edit: How about writing your income in the multiboard? You'll need to use the GetLocalPlayer function to make a different multiboard name for every player. That would be nice.
Also - sometimes it's hard to check how much gold is left in the gold mine. How about adding a third column in the multiboard that would tell you the gold in each gold mine? Oh yeah... The color of the gold left could also be green/yellow/dark yellow (orange) for the ammount of upgrades done.
I hope you'll do that ^^ You can leave the AI if it's hard to make (well, the game NEEDS to be played with real players), but I think the other suggestions are needed and fitting.
Edit: How about a rematch command? A single game usually doesn't last longer than 10 minutes, so a rematch mode would be great!
Edit 2: Well I got pwned by a hard comp, because he was feeded and the game lasted 26 minutes (wow).
I found some things that need to be changed.
First of all: The Initial mana of the casters. What's the point of making the upgrades if the casters don't get full mana when they spawn? Their regeneration isn't uber fast so I lose almost 1/2 of their mana. Set their initial mana to 1000 so they will have full mana on spawn.
Second: Skeletons suck
Third: The Arcane Mage's abilities suck the most... Stealing buffs? Omg... The first place goes to the drainei mages for their healing + inner fire. The second place goes to the kobolts for their bloodlust and curse (skeleton summon kind of sucks -_-). Arcane mages are almost useless.
Fourth: Ogre's are imba. Compared to the Gnoll boss, one ogre can easily take down 2 gnolls (maybe 3 even) and he costs only 25 more gold. Ogre is imba as shit -_- His cost should be something like 225-250.
Fifth: Buying cheaper units is better than the 75-100 gold ones. Why? Because of simple math! The expensive units take 3 food instead of 1, so they decrease your income by an extra 1.5. They cost 50 more gold (twise the cost) and have a bit more hp and damage. The pickpocket ability gives equal gold on all units, so if I'll have twice more units, I'll get twice more gold from them! So basicaly, buying cheap units is way better (unless the expensive unit's pickpocket ability gives more gold, I can't check that, because the tooltip doesn't say anything).
Last: The gold nova is imba -_- And what's it's AoE?