Oh man. It's been a long time.
Like people already said, I'm worried this will turn into a vicious cycle. He optimises for a new version of Android or a new phone but when he's done, a newer version comes out and then it'll be "Let's just do this one real quick" and then when it's nearly ready, another newer version comes out. I'm not trying to sound too entitled here and I know that real life can *** things up, but if something like this happens or is happening right now, do one version, push it, then do another. I mean, it says "You are now a beta tester for this app" for a reason. If I want to wait, I could just use the normal Play Store version.
Again, we don't really know what's going on (or at least I didn't bother to read all posts). Some communication would be nice, otherwise, this can be considered dead. My expectations for getting any updates in the future are basically 0 at this point.