I played your game on my old LG phone with Android 2.3. It worked fine.
I thought that the background graphics looked nice and liked the choice of "Game Over" text. Funny that you made a green flappy bird for the SewerFish.
I have some questions:
1. I am wondering what aspect ratio did you use when you made this game? The Score, Game Over and other such text look like they are all a bit to the left on my 45mm x 68mm screen. You could make the word "Score" and "Best" like 50% bigger so it easy to read-it's too tiny as it is and you have tons of room to work with.
2. Did you mean not to scroll the very bottom?
3. How big was the size of your background picture?
4. What did you use to "sign" your game? the tutorial here? (I haven't done this yet.)
5. Was using Ludei as a wrapper easy? Any trouble with that?
6. Any weird issues at all when you were making the game?
7. Did you understand what that "opt out" on Google Play store was all about that I keep hearing about?
One more thing, I would put the name of your game and whatever information you want the player to remember on your Game Over screen or take them back to the start screen so that the player can remember it more.