Kill Everyone On The Screen
To knock everyone off the screen just press 1am pesticide. This cheat will make all the bad people to fall right off the screen. This also works on the bosses. For the bosses you will need to do this more than one time.
To Get more lives put in 1am cheaters. Do not skip spaces just put it in. After you've done it around 20 times it will go back to 00 or past it and you have unlimited lives.