A review to this map (solo) :
First I tried the five heroes, well...
+Rocky (Mountain Giant)
The most powerful so far with spells, summon, aoe damage, his spell that throw rock in chain is excellent. His aoe however often lack of precision and don't do enough damage for an ultimate in my opinion.
Leyla (Lightning Archer)
-A pretty good hero, the lightning phoenix fire is wrongly done through.
-It can only affect a same unit every long seconds yet the passive can sometime fire up to FOUR time on a unit before the first lightning ball hit the unit. I think it'd be better to lower the duration of the passive and better increase by two or three time the speed of the lightning ball.
-The attack speed increase is utterly useless, between image and casting time there isn't much point to it, add mana cost and it's a spell that shouldn't even appear as a hero spell. Maybe a multi-lightning chain or a multi forked would look better.
-Ultimate is nice combined with lightning phoenix fire and the schockwave passive.
Omaga (Nature Druid)
Healer...healer... healer...
-Way too much heals in a map where heroes generally lack of AOE. Need some changements in the spells. Aside the summon spells of treant shouldn't use tree in a defense map, this is very troublesome in most case. Specially if the tree don't regen.
-I recommend to make spell perhaps with two effect, both damaging and healing at same time. Also root mass root for 2 second yet if it doesn't damage it's mostly useless. We need AOE !
Un'shalah (Shadow Assassin)/Kael the Wrathbringer (Warrior Druid)
-I passed through their spells quickly, their are too passive. No player can really do something because they just need to spawm spells without targeting or anything and sit while their hero attack (and die because of the overwhelming number in most case).
-Assassin shouldn't have as much range as the archer, that's pointless. I propose to increase Archer range to 700 while assassin decrease to 400. It would be better balanced that way.
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For heroes spells that's all. In general there is a need for changing spells so players can really do things smartly, you can't really have a game-style at the moment. Make heroes really interesting to play, make most spells with a target. For assassin in instance, moving from target to target would be a way, for summon there could be way to give them bonus like depending of the number of allies when the hero summon.
Spells are nicely done, but ideas are mostly bad. (the best is for me the throwing rock waves of Rocky, loved it)
Perhaps replace additional stats with a 5th spells might be better, for the two passive that lvl up perhaps use a spell-book.
+Items :
Let's face it, there is a LACK of item there. Even potion that are now cheaper need to be at least with 3/5 or even 10 charges when you buy them, one charge potion is a slot wasted. (still good mark with stacking system).
On equipment items, there are way too few items, too conventional and some ridiculous. talisman of evasion 8% evasion for over 3k gold ? That's overkill...
Items with aura and all would be better, definitively.
I can't say much about items as we lack too much of items at all to speak about it. Sadly as items are really the only way for the player to evolve, the evolution of heroes are extremely limited.
+Misc possibilities :
We have armies and towers to help and such yet we can't upgrade/buy to increase the army, that make it more annoying than useful. A shared team bounty for when the army kill would also be useful.
As gold can only go on item at the moment, being able to increase the army potential is almost a must. (being able to repar building would help too)
+Others :
-A bug that happens when you make the numbers of monster higher the the default difficulty, mobs move barely and then are struck, making the game utterly impossible to finish. I saw you move the unit one by one, perhaps to fix that, move the units with the "group unit" action and move 10 or 12 (max) units at the same time. It MIGHT fix the problem (or not). Otherwise the mode is unfortunately useless.
-A repick mode would probably be appreciated here.
-Don't make escape shortkey and camera work together, use command. It's very annoying to have camera affected when you just want to get out of the choosing skill pannel (or spellbook but this map doesn't use those)
-Finally, heroes should really have more life or have mean to improve their armor, adding items might fix the problem. Otherwise Rocky which is normally a tanker can't even tank properly (see turtle siege mini-boss)
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Overall this map have potential, yet it lack depth in about everything excluding monsters abilities and terrain. For now I would say 3/5, perhaps 2,5/5 as the map truly lack of possibilities for the player. Adding things however can make easily this map raise to 4/5 or even to 5/5.
And finally if you need some help in making thing, I am a knowledgeable mapmaker and I can spare some of my time if you need some help or idea into the making of this map. (and yes, I love defense maps).
Good luck !
Approved
You are right, I fixed that 
but this must be fixed 
i will do tests soon...
) also many spells are remade and here example of some:
only custom made by me so far because I want to people get used first to normal ones 
