Really nice art and sound effects. Definitely needs a way to rotate the camera, though. A couple of times I thought I was placing archers on top of walls, when I was actually placing them on the ground behind the walls. I also accidentally hit the trash can button and wiped out everything I had, so some sort of "Are you sure you want to delete" popup would be nice. UI scaling would be cool, too. I'm on a 4k monitor and the icons were really tiny.
The gameplay here is fun and simple. Good luck with this.