The Engrish is pretty hilarious. Can't switch weapons (you pick up a shotgun in the begining) nor can you reload before you run out. No health kits either. Needs some tuning to become a great game.
Hit boxes are a little weird, make the AK-47 a machine gun not a semi auto...clicking 500+ times to beat a stage is annoying. Also the background music needs to be longer / different the 10 second loop is really annoying.
This game is missing critical features as mentioned before, wave counter, pause, speed options, tutorial, etc.
Not to mention just how hideaously inaccurate the troops are even at point blank range. Also a mode of play where you have say a starting bank of 100 points just to tinker and see what is worthwhile to use.