I was really feeling the vibe, then the music stopped and everything went silent. Second level did not load. There are two major faults that can cause this: -Level was not added to your build index, or your index number/string name did not match in your code to load the proper level. If you used a string name to identify the level and load it, probably a capital or spelling mistake. Not to worry though, every one is here to learn!
edit: further below I read you have a UI issue that is causing the problem. Check your canvas settings, make sure it scales with the screen size (set slider to 0.5 in order to scale based on width and height).