So that Android port of the game has 2 components: The Android Launcher and the game itself (which is in .rpa format, and available in either high-res or compressed - The game is rendered in 1080p for both of these versions, the compressed has lower image and video quality).
You'll need to grab both of these to run the game on Android. We actually have a handy step by step visual guide here:
If you run into any issues or have any questions, please let me know and I'll get back as soon as I can o/