Add in-app purchasing to my existing game and make it scalable to any iPhone screen size. -- 2

Hi! Please read everything and understand. I have written a game mainly in swift and I need someone to code the following 4 "power-ups" in my existing game, and implement them as in-app purchases. The existing game already has game centre high scores and works nicely. I would also like you to clean up / optimise my existing code, written in Swift. There will be 4 in-app purchases: 1. Spray - When the user clicks "Spray", all the enemies will reverse their paths and move away from the player. 2. Blood - When user clicks "Blood", a drop of blood goes on the screen where the player is and all the bees become attracted to that drop instead of the player for 10 seconds. After 10 seconds they go back to following player 3. Shield - Already half implemented. When the player clicks "Shield" a shield goes around the player for 10 seconds. The bees hit this shield and cant get past it. Their path changes 4. Ghost - Already implemented. When a user clicks the ghost button, they go invisible for 5 seconds and cannot be hit in this time. If you have read everything, please message me saying "soup". I can show a bad mockup of how the purchased power-ups would be selected.