That was fun! For the first couple runs I didn't realize that you could intercept enemy bombs with your mortars. ( I did see that you put that in the instructions so it was just an oversight on my part) and once I figured that out I had a lot of fun. The main mortar mechanic is really satisfying and I was kind of going back on forth as far as firing both shells at once or alternating, seems like there are lots of ways you could go about strategizing with your two shells.
Great work!