Phantom of the Asteroids

Story

The earth is under threat from an asteroid hurtling towards it. Your mission is to destroy the asteroid and save the earth from invasion by a swarm of bloodthirsty Phantoms. To destroy the asteroid you must find and collect the 36 Uranium cubes on it. When these are gathered together in one place you will have 5 minutes (real time) to reach the teleport and escape before the nuclear explosion will blow up the asteroid. There are 3 types of force wall which will bar your way. The cyan, purple and green force walls are all of varying strengths but contact with any of them will result in insta...