11/10 sound design, absolutely fantastic, no notes.
*Edit, I realized you probably actually do want useful feedback. Initially, it was a little difficult to figure out the unit costs, but I stumbled across the hover quick enough when I took the time to look on a second playthrough.
It was also a little hard to figure out if any of the melee enemies were fighting back or not, until I got to the 20s and gold knight crowds big enough to instakill my poor zombies formed.