I need to talk about Chicken Invaders

There is a “Scrooge McChick Certification” medal for amassing 100,000 keys and InterAction Studios did say that you will be able to purchase keys in-game in the Plan Update #01 :

With the 100,000 keys medal added into the game, I hope InterAction Studios will change their mind when the game is fully released, and make one-time permanent IAP instead:

The IAPs always heavily affect the rating of every game, positive or negative so this is very important.