Okay game, but has problems
Add a reason to continue to play after the first time.
There is no story. no high score list. only 4 different types of enemies. repetitive gameplay.
I still played, but got bored really quick. I remember my wave number, but my high score was 95065 (after my first play).
another issue with the game is that you can resize the website, on firefox it is ctrl+scrollwheel. This helps you "cheat" in a way because now there are gray borders on the left and right sides. It is cheating because on the left gray area you can see where the enemies spawn offscreen.
I chose the glock, used it until I got enough money to buy the most expensive gun.
The game gets harder because there are more enemies and because it's not exactly point and click, like you have to wait for the crosshair and you have to aim correctly since the enemies are small (their heads are anyways), it gets difficult when there are many enemies moving at different speeds.