I like the idea of having a tower defense game where you have to manage building defenses, repairing the crown, and fighting yourself at the same time.
The difficulty curve was a bit odd though. It is very easy till the timer hits 200 and then it suddenly becomes impossible. It also wasn't very engaging to think about a strategy because you can just spam the defenses at the center. Maybe you could limit the number of placements at a location or spawn certain types of enemies from just one direction. Overall fun game.