Fastest Points + DNA
The level is number 12. In The Belly of chapter 2. Rumble in the City. play through til the end, and when you get to the boss, soon as you enter the door, do not walk any further. use a second control and keep shooting the alien ships that drop the bad guys down. each ship is worth 800 points and some amount of DNA depending on your multiplier. i was getting over 1500 points and about 500 DNA with a 2X multiplier per second. the alien ships keep respawning in the same spot that it was killed so you really dont have to aim much.