I've already watched the videos, but they aren't step-by-step tutorials.
There's so much information missing from the videos.
As I wrote, tutorials that build on each other and explain the entire software would be good.
The program is good, no question about it, but it would certainly be easier for many people if the software was better documented. Videos are much better at explaining things to others.
Horizontal platformers or vertical shooters are certainly very popular and many people would be happy to be able to create games with them.
I hope you could make a few step-by-step tutorials.