Wave 70 is not a bug. The trick is in the Grows When Shot description. This boss gains energy when shot, but loses when he releases a drone. You really shouldn't shoot at it at all, just destroy its minions until he shrinks to zero. Hmmm, maybe this was a design error on my part, mixing deep thinking in a shooter game, I'm not sure?
As for the settings going back to main menu, you're right, this is a bug. It used to work properly, but I refactored some code just before releasing and this got broken. I'm uploading a fixed version as I write this, it should be up in the Play Store in a couple of hours.
Having to pause shooting to Reload is deliberate. At first, there were no Reload button, but adding it added a dimension of difficulty to the game, and made it more interesting.
As for the package name... it's complicated. As you can see in my blog at Day 1, I choose this name at first, and then I built a libGDX project using it. At some point when I finally decided on Drone Invaders name, I tried to refactor and Eclipse was not able to do everything. libGDX projects are set up by some kind of a setup wizard, that does some find/replace of strings and whatnot, so it seemed impossible that I would be able to do this manually. Although, not that I think of it, maybe I could create a new empty project using the wizard, and then copy all the source code there. However, I would lose all the ratings and stats I have so far on Google Play as it would be treated as a completely new game. :(
And I guess I will have to make e-mail clickable now ;)