This is a really promising game and you've put an incredible amount of work here! I've really enjoyed the game so far.
Something that i think your project may benefit from here is asset compression. At 857+ MB it's quite a large install, especially for an Android build.
I'm assuming you've scanned the artwork or taken photos. Directly importing those assets into the game engine will give you a very large install size.
If you've got Adobe CC (Lightroom, Photoshop, Bridge or Camera RAW) all support batch image compression that will let you keep the same quality but reduce file size. There are a number of free online tools that can help with this.
I'm looking forward to seeing where this project goes, keep up the good work!
Good luck with your development! :3
