The Crispy Chicken, second boss of Genetic Disaster, is really not that hard to beat. He appears as the boss on the 7th floor. He has two phases, though there is very little difference between the two phases.
In the first phase, he has two possible attacks. He can either pull out sawblades that spin around his body, and he moves slowly towards you, or he pulls out some plugs, and makes a mad dash towards you and deals damage on impact.
In the second phase, the attacks stay the same, but he can spawn in eggs that hatch smaller chickens. They don't have a lot of health, but they can rush you and deal damage as well.
Beating the chickens in really not that hard if you know all the controls. I recommend getting high-burst-damage weapons, such as the heavy shotgun, chewing gun or something similar. When he uses sawblades, play close, and pump in damage. When he rushes you, you need a plan to get out of the way. This is the hardest part, getting out of the way. As for as I see it, there is three options for this:
- Play as a high-mobility character (Sneaky/Panic), and use your ability to dodge
- Use high-recoil weapon to burst yourself out of the way
- Use the mutations "Human Torch" and "Firefighter", get a gun that you can set yourself on fire with, and use the speed boost to dodge.
Other than that, I also highly recommend the purple-tier weapon "Eradicator". There are two versions of this weapon, you'll want the one with stripes on its barrel that shoots a tripple shot. This weapon can literally kill the chicken in one hit.