This was a lot of fun. My only gripe is that some things that that I felt like should be destructible (like buildings and fences) weren't. Unless they just have so much health that I just never made any progress with them. I think that bit could use balancing. Also maybe adding some kind of effect (like a color change) to signify damage percentage would go a long way!
Other than that, I really love the music. It just felt like it was mastered really low compared to the sound effects. Maybe bring the music up or the sound effects down in volume.