Nice! Neat to hear the FM towards the end. It might be nice to have a 3-deep op patch demonstrated, as that is where most FM algorithms fail. Or show, if your program supports it, the ability to copy a pair of ops and tweak the pitches slightly on the second copy, to get a bit of phasing, thickening up the sound (a very common and useful FM programming technique).
Overall, maybe the demo could be tightened up a bit, depending on what the goal is, and build to a final song that uses most of the parts built along the way. Is it maybe a bit long for something that is supposed to be āsimpleā? Also, very difficult to read the text, even in full screen, and maybe voice-over explaining what you are doing? But it depends on what the goal of the video is.