This is a limitation of the RenPy packaging framework, I'm afraid. Android devices and OSes are all slightly different, and whichever configuration we pick, some phones won't support it :/ We try to go for the most broadly accepted setup, but I'm afraid it won't work for everyone.
Someone else was able to fix it by:
- Opening the game, and letting it crash
- Going to Settings > Apps > Ravager > Clear Cache & Data
- Clicking Force Stop
- Reloading the game