Which units would you like to replace/add?

That would be a very good option! :)
Otherwise, there are too many dragons :smile18:. And they aren't even beautiful.
It would be even better to replace the zombies with someone else :smile54:!
It's hard to even make them decent cannon fodder.

I don't think anything needs to be changed; I think everything is fine as it is. The fact that there are too many dragons doesn't mean they need to be changed; it's enough to make them stronger, and I'm willing to argue about their appearance; they turned out quite well.

P.S. I've never used zombies as cannon fodder myself, but I know people who do it easily; I just play with a different tactic.