The fact that you gets a level 2 after 567 days...
It began lagging when I reached 567 days and tellng me gongratulations you are now level 2.
Quite stuffy game! And the stickers thing made it even stuffier!
I got 2 hours of it. Until the whole game just crashed.
No place to improve here really except for the music, which was quite annoying until I finally figured out there was a no music button there.
What happens after 20 stickers? I got 19!! it burns me up.