Very nice job. The controls, both camera and movement, feel really good. The map is well made (loved the detail of those parking lot entrances actually opening up), and the enemies are smart enough to not get stuck in nooks. I think the game could use some long term objectives, other than "do not die to the endless onslaught of enemy tanks", for the player to work towards. I didn't really see the connection to the theme at first, and only realised it by going to the github page. Other than that, really good submission, congratulations.