I admit that I haven't read everything, but that's because I got stuck on the first paragraph of the README:

> New UI pattern for file manager type apps. It makes moving and reordering files much easier and more intuitive than traditional UI patterns.

You should go into more detail who the target audience is here. Casual users don't care about moving and reordering files into place meticulously. They just want to find stuff quickly and are will prefer a better search box over a better filing system.

I'm sitting on the other end of the scale. I do obsess over file ordering to a certain extent, but then again doing any of this ordering on any sort of phone UI drives me crazy because of the form factor. I'm much better served by something that lets me do this on the big screen. Right now I use KDE Connect which has a feature for mounting the phone's FS on the PC via sshfs. Then I can use big-boy file managers (or heck, just a terminal and good ol' coreutils).

I'm not saying that there is no place for your UI design, but a good design starts from which users have which needs, and your pitch (i.e. the README) should reflect that.