in 2017

 It's the space.

I've used up all of my space in the game. I wish there was an option to the game that, when you used up, or nearly all of your space. You can choose whenever you're ready to add space. I hear they can't do this because of the users with bad mobile tablets/phones. Overall, it's a good game with nice touches to it; It's the space that I'm dealing with.