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Would be awesome if the military (garrison units) would have some
digital camo or just black/dark grey color they would look more badass. I like your work.
ps: Is there a reason why you did not include some "build time" for the buildings? It feels a little cheaty when I spam walls XD

Agree. it looks Cheaty and Un-Natural.

But, No, Don't add "Construction Time" on each building 

Because, it cost much for a programmer.

[idea] Just give the Game

{a 1 second "Global Cool Down Time" for all buildings}.

and 2 seconds for "Military" buildings. 

So you can't spamm wall.

E.g. if you build 4 length wall, 

you need to wait for 8 (2x4)  seconds

to build a next Military building.