Orange Checkpoint. My fingers hurt too bad.

Note: The first platforms are purposfully hidden from sight, get some height and you'll see them.

Press Lctrl to return to your last checkpoint, shift to sprint after you reach the 2nd checkpoint, double jumping is possible after the 4th checkpoint, and the final checkpoint grants a power which will let you ascend, try clicking and then doing a double jump.  There is no ending beyond escaping, sorry, ran out of time.