Memorable Melodies v1.2 is at beta testing phase. You (anyone) can be a beta tester via Google+ community Android Developers. Find my post there and use the link I’ve provided to become a beta tester.
I’m not sure if there is anything more I can do with current version of Cerberus X to make it more compatible to different Android devices. On my good old tablet that runs with Android version 4.4.2 the game has worked fine from the very beginning of version 1.0. The game is compiled to Android with SDK for Android 8.0.
Version 1.2 beta has “secret” cheat to clear all the mistakes made. I’ve decided to leave the cheat to the game so that one can compete against oneself as one wishes. The “secret” cheat is to tap at the upper right corner of the screen during game play to clear all the mistakes. Useful also to beta testers.