I love that you have a README and License file (main criteria for open source category). You can spice up your README with some of the screenshots from your game.
Music is good, sound effects are great. The cat is super cute! The animations are adorable. It'd be good if there was a counter or timer or similar so you know when the end of the day is coming; I ran out of AP very quickly with no indication of when I would be getting these back. Maybe a little more variety in the shop pricing too would make the game a little more dynamic.
I like the achievements implementation and the fact you can move your game between devices is great forward thinking.