This was a really neat concept! The mechanics were very reminiscent of tower defense games. I loved the sound effects and art design. The UI seemed very thought out, but the interaction felt pretty unintuitive. I wasn't sure most of the time how I should be using the UI. The map felt a bit too big to keep track of where enemies could spawn. If you can give the player a bit more direction and hone in the gameplay loop, I can absolutely see myself getting lost in this.
Altogether an excellent submission!