It's awesome but I don't know how to unlock the Hackdagame Medal. Here are some tips though.
1.) Always go in the middle, going in the corners will get you killed easily.
2.) You get stronger as you progress through the game.
3.) Take out the Special Guys first, like the ones that spew the green ones, the fast red ones, & the invisible ones.
4.) The Invisible Guys are weak but can be Invisible so it is essential to keep an eye on them to kill them. One shot kills them all.
5.) When you have Multi - Shot & there are no baddies yet, try going around in circles, this is mostly effective when dealing with the Invisible Dudes.
6.) Try holding the Left - Click, the gun will turn into an UZI. One left click & it will just shoot once, if you hold the left click, it will shoot many times.
7.) Medals like Newb, Veteran & Hackdagame can only be achieved when you die, for example: you get a score of 63,212 & you die, you get Newb & Veteran at the same time.