Really nice tower-defense game. I like the idea of focusing on ammo instead of just plopping down turrets. I had quite a bit of fun, however the coontrols felt a bit labour-intensive at times and i had trouble quickly grasping what kind of enemies i was facing (and what kind of ammo i needed to load against them). One thing that could have helped would have been to be able to click on the machine-guns directly on the map to choose their ammo (maybe autofire and detailed info can still be shown on the side, but having to switch between managing guns, looking at the map and managing production made me feel like i was not doing any of those right :) ).
But overall really cool game, definitely would like to see where it goes from here if you plan to take it further!