Well, if an overall consept is what you seek, then this is the thing for you:
Try to streach out the auto-casting abilities as possible and put only auto-castable abilities on special units. that way they are effective and they have power. Be sure that the unit will be usefull, not nesesarily strong.
Oh, good, when I saw a PM I thought "Ok, so who have I insulted and why does he send me hate mail ? "
Well now there is castle fight 1.13. Some maps shouldn't be updated. I mean, every map has one "glory" version witch is the best one. Castle fight 1.10 was this. 1.11 wasn't bad too, mostly balance stuff. But the new features and systems in 1.12 totally ruined the gameplay for me.
listen, Blizzard's new patch just changes Jass. This makes most previous systems not working. Users are pissed that they have to do a lot of work again. + Most of the older maps don't work now. I mean.... I lost Castle Fight 1.10.... (I know that it is an old version but the new versions suck monkey c**k
Anyway, you are maiking a project huh ? Well, I'd gladly do some consepts on it if you want.
I will tell you one thing for mapping: If you start a map, release it. Even if it is not the best one you have done.
Btw, I want to ask you something: Shloud I give a new set of abilities for the units in Protect the tower, or is the current one fine ?