Combining two projects

How would I integrate the code from https://microstudio.io/i/Heythat/healthtest2/ into https://microstudio.io/i/Heythat/galaxyrush/?

If I only need part of the code I open both projects in their own tab and copy/paste around. If I have functions I use quite often I define as a library and add that to my project.

Is that what you want to know?

Well, I only need the part that gives the player the health bar from the health test and apply that to galaxy rush, so I don't think I need a library. But I also can't figure out to apply the copy/paste right.