In my opinions, I think this map should have some additions likes:
Heroes:
Heroes skills: there are something wrong here ? Some skills not work correctly (ex: skill 1 of Nature, Healing 400HP + 20 Regen HP in short time, when I buff for my teammate, it healing nothing but + 20 regen in short time)
Some skills make me very confuse that if it's useful or not like skill + 2/6/8/12 armor ?? @.@ That skill will help in which situation?
Or like + 15/20/25/30 str and +2/4/6/8 armor ==> ok, will it help in late game? @@!
Dame of skills is not equals between heroes, I mean there
are some heroes has very low dame skills and helpless in game :<
+ SHould have some summons skills (of course after summoned, the creeps has some skill itself nor it will be very useless)
+ More aura skills like dame/atk speed/regen/etc
Items:
+ Item to burn mana
+ Item has ability to protect hero from spell/magic dame
+ Book store (when I full of item, I have no idea what should do with the rest of money, and if you have a book store selling str/agi/int/lvl for gamers, they will love it)
+ Item regen HP by % of str or have more regen than items this version
+ Item add HP more than items this version (between 1k-3k HP is better)
+ Item buff HP more than items this version
==> when you're in the middle of game, you have to face to the boss and those items that buff, add HP or regen this version is too little! boss so imba when we have to face to them with the ability of items like nothing.
Modes:
+ Mode to close/open gate (very necessary coz sometime people just want to play with their friends and they don't have enough 5 to defend all gates)
+ Mode random hero, I really don't want to waste 500 gold to pick hero -_-
+ Mode easy - normal - hard. really want to challenge myself with this map
Etc:
+ Add events occurs randomly in the game ?
+ Add some mini games
+ Really expect some secret item will appear after destroy the tower of the Guardian
+ More waves
+ Fix the gold dropped after kill creeps, especially in early game - wave 1, some unlucky time, 1 gate dropped not enough to buy items
Well, that is my personal opinion. Hope it helps you create a new more interesting map =)