Eye'scape- Escape the Eye

There was once peace, when one day, out of the blue, a giant ball slowly descends to Earth. Eye! Because of the atmosphere, and increase in technology, the planet was able to slow down before landing, and therefore made no hard impacts. Suddenly eyeball aliens flew, jumped and ran everywhere! Some flying eyes carried off scattered humans to the planet, while military forces fought them off! You, being one in the military (undercover) snuck onto the planet with your plasm, since most of the aliens were on Earth, and found the core generator (the thingy that makes the planet fly!). Turning it on, it began to chargeup, soon to fly off, never to return, and it made a loud earpiercing noise. The creatures heard it and all dashed onto Eye, for there was no way to turn the core off. Now, for you to escape and return to Earth, you must run and fight for your life, because there's no easy way out! Survive all the creepy levels to get back home! It won't be easy!