Overall this game looks great, but I had difficulty playing it, even on easy. For me as someone who's played RTSes I found the select/order the opposite way around, and the zombies seem to attack too soon before I can get any units out & about. Additionally it's hard to distinguish recruitment houses from normal ones.
Like others, I think with a juicy layer of polish wrt controls, having some time before the zombies appear, and other touches, this could be really neat! I played something similar a while back by the fine folks at Blendo Games, maybe take a few cues from what they did 👍