Want a Nice little Glitch? Once you get the Chainsaw and Hunting Rifle, equip them both. Start a Day, pull out the Chainsaw and keep shooting. Hit space a couple times, then let go of the mouse and switch to your hunting rifle. You'll have 99 shots the HR, with no reload time.
To Get the Death Star Badge, make sure you have everything.. Everything upgraded before you attempt this. Basicaly, i when to the right side of the screen, and held down the mouse button, and just strafed up and down the right side of the area. Just sweep up and down, using bullet time when the purple ones appear. Up, down, up down. Its repetative, but it gets the job done :D
Also, dont worry about money. I know its tempting, but just ignore it.
Funn Game. To get the Rocking a Rhyme one, just upgrade everything, then time it right, do a handstand untill the large rocket stops, then do a backflip :P