Needs work
"Upgrade Weapon" doesn't upgrade it enough (maybe not at all) I had 3 and it still took 2 shots to down the kid, enemies come much too few in the beginning to upgrade anything, enemies come way too fast after level 5-6 even with a high rate upgrade, birds deal way too much damage (something on level 2 shouldn't come in that fast and take 1/3 of your base in a hit), and enemies bearing down on you from the top part of the screen doesn't give you enough time to react, every part of the screen should be the same distance.