This is too unbalanced currently.
Sure, it is player vs player, but a luckier player, or player that would have played this before, would win hard.
For example, if I spawned two dragons, I killed the enemy castle in a few seconds, and the towers had barely any effect on them.
Other flaws:
-Really confusing to know what spawner building you should use.
-Many buildings could spawn the same units.
To be honest it felt like it was a pretty sloppily made map. Here are some of the reasons:
-High number of uncustomized, or little customized units.
-A small farm to provide food, instead of having any normal building provide it, or simply add it by triggers.
-Each players base have very limited decorations and looks confusing to look at.
Other general suggestions:
-You could ignore the towers and go straight for the castle. In my opinion it would be better if you had to take the towers down first.
-Autocast on your units spells could have been nice, so that you don't have to control them all to get maximum effect.
-The buildings along the lane could obstruct the movement of units, making them get stuck. I suggest you move those into the wall, so that the pathing is unaffected.
-I suggest having a much smaller number of spawners, perhaps three of them, unlockable over time like Hero Line Wars perhaps?
This map has a long way to go before it can be approved.