Yes, someone made one.
"You are Dr. Heiter, a brilliant German surgeon who has gone mad and surgically attached people ass-to-mouth to create the Human Centipede. Unfortunately, your patients are not pleased with being human centipedes and have begun to rebel against you.
Now you must take your trusty rifle and put down these human centipedes like the bad dogs they are. Don't forget to watch out for the police and collect glasses of water with roofies to slow down the centipedes!"
It's pretty similar to the old Atari game Centipede.
You can play it here:http://www.newgrounds.com/portal/view/537029