If you have gotten to the level where you end up where you started, just walk past the beam, get the 2 spikes, use ONLY one spike on the yellow block to wall jump, then walk forward. You will be stuck in a cage with your clone. Back up, Run to where the gems are ( Be sure to jump above them!) , and fire a shot quickly. It will pause your jump a little. Then quickly move to the left edge in your jump. If done correctly , the clone will die and not you. The cage will then break and then walk to the right after you are out of the cage. Go in the beam, and you are free!

- Akthreatt