Nice. Due to a couple of clever design decisions your game feels quite fun and strategic. I'm talking about the ammo box in the center and the reload mechanic of course. It's nut just running in circles but being strategic about how and when to get new ammunition. Well done!
Some simple feedback sounds for reloading and taking damage would have been great. Would have loved to have some sort of score as well. That way I could have posted it here and you would know now how far I made it. Nut sure if I've even seen all of the game's content yet... on the screenshot I see a blue enemy? I don't think I've reached that point in the game. :D
Overall very well done. Definitely a game to be proud of. ;)