Look for "Unlimited Money" save editors that modify your official save file (requires Root), or simply grind the "Flying Bottles" mini-game in the official release for coins.
Launched in 2013, the game allowed players to adopt a kitten and raise him to adulthood. The mechanics were simple yet psychologically rewarding: feed him when he’s hungry, put him to sleep when he’s tired, and take him to the bathroom when nature calls. The inclusion of voice-recording technology, where Tom repeats what you say in a high-pitched voice, turned the app into a viral sensation.