As for the feedback, fair enough. As I said, this is just a demo and it's in its early stages. It has no goal of replacing professional video editors or even matching their features. Some annoying bugs and missing features, we will tackle them.
As for your last comment, feel free to judge, but I can say it was not quick at all to do this just to post on HN. You can check all the commit history and the codebase so you can have an idea how much care was put into it.