Can't play and listen to music – POP4 Number Puzzle Game Review

I would absolutely give this app five stars otherwise. It's a simple, fun, mildly addicting, and challenging puzzle game. However, I'm really disappointed that I can't play music (from Spotify) while playing this game. Hopefully it will be addressed in the next update. Also, I'm really hoping for an undo button. My fat thumbs make for some misclicks as the tiles get smaller.
Review by Daniel0016 on POP4 Number Puzzle Game.