Hey I played game but I am 2 lazy to write review 
Still I have some ideas:
Aura of Weakness:
-Reduce enemy units armor by X
-Reduce enemy hero armor by X*2 Frozen Aura:
-Reduce enemy units attack speed by X
Lightning Aura:
-Deals X damage to enemy units each second
-Deals X*2 damage to enemy heroes each second
You already have few auras like these but why not to improve them!
Btw icons are very poor!
Leaderboard wtf? Create multiboard that will show number of living units for each player, number of kills, current gold, elapsed game time, main building level, hero level and so on!
Damage and armor upgrade icons are fail, I will create new ones for you!
Also download icons from THW and use Passive ones for auras, lol your slow aura use tornado active icon :P
Recipes are poor as well, you need 1 more item to replace that scroll in base :P
Also hero pick look a little bad, I don't know what to do so I just create new hero each time 
Why not to create few heroes (5 agility, 5 int and 5 str for start) with different models, attributes and stats, you pick model and then learn spells liek for any other custom made hero ingame!
Still each hero form above can have 1 or 2 special abilities! (example: hero can look like Blademaster, his unique spell can be Ultimate Strike (20% chance to deal 0.5 of current target unit hp as damage to it, 2nd one can be active, hero can activate bladestorm becoming immune to magic for 4 sec and deal 50 damage per second to all nearby enemy units)
I can work with you on map and create multiboard and systems if you want?
So what you think ^^
Will upload icons soon!
Stuff like that could be a big help sometimes 
