I think this game could be really popular if you made some changes here my ideas.
1. Change the description, it says to protect your TANK. 2. Maybe have some new enemies, like some have chain guns. 3. Being able to fly to the top of the screen, you can only fly to the middle. 4. Have more weapons to chose from or upgrades, like armor piercing bullets. 5. More upgrades.
this game sucks because
1. it's basically C.O.D.5 nazi zombies
2. some things are barley even changed, "double cash" "double points", "double damage" "instakill", the bomb thing which I forget what you call it "nuke".
Kind of the same as E.W.3. 3/5 maybe after a few new updates it will get better. It would also be a nice touch if they added multiplayer where you battle other people.