Your game is nice ! The music was very relaxing and fits perfectly the game in my opinion.
I am also wondering what game engine do you used or if you've created it yourself maybe
Besides that, congrats for what you have made !
Thanks for sharing your take on the game!! we are glad to know you liked it! We used Cocos2d-x, it is more a game development framework than an engine, but serves its purpose really well.
We checked your game too, amazing work, keep it up!!