Hello,
Please download the .apk file and the assets.rpa files marked as Android, you need both.
On your device then launch the .apk file and it will try and find the assets file, if it cannot do it automatically it will tell you the location you need to move the assets file to for your device.
Go to your phone's file manager and move the assets.rpa file to the location the apk tells you to.
Then relaunch the .apk and the game will launch.
Hope this helps, if there are any further issues please let me know, Discord is the best place to leave any bug reports or problems!
WP