I just released a new update now that contains a new drum and cymbals. I am also in the process of making another update in which there will be a "Yes or no" option when purchasing a shop item. I have just finished that update, as well. Now I'm just adding what each upgrade does to the shop.
 "The Green Kingdom"){kind=icon}
 "Snake's Adventures"){kind=icon}
 "Guess the Number"){kind=icon}
 "Little Drummer Boy"){kind=icon}
 "FPA: World 1 Remix"){kind=icon}
 "Everybody Edits"){kind=icon}
I just released a new update now that contains a new drum and cymbals. I am also in the process of making another update in which there will be a "Yes or no" option when purchasing a shop item. I have just finished that update, as well. Now I'm just adding what each upgrade does to the shop.