You might be asked to complete "offers" to get the password, which never actually works.
The game is designed for progression; look up "Shadow Fight 2 move combos" to beat bosses without mods. shadowfight2_2.22.1_password.zip - Google Drive
If you installed an APK from the ZIP, go to Settings > Apps and look for anything suspicious with "Overlay" or "Accessibility" permissions. You might be asked to complete "offers" to