The launcher portion is very interesting and looks like it will be great but as to the base version (as the alternative i suppose) you probably want to split the files. Specifically i would suggest leaving in a bit of the game at the front (as a demo) and then cut off roughly 1.5gb chunks from the game. By cut off i mean pack the files into RPA (archive) files for independent download. This would let people use the standard apk to keep up on the newest content, the game to stay in one piece and everyone easy access to the old content with minimum fuss.
I don't know exactly how to create the rpa files, but most of the porters on f95 do at this point so that's a possible direct source for how.