I know the game is setup to where on the last unit you get to see the percent and see where you are. My suggestion is simple really.

I'd like to find a way to get a credit purchase to unlock a small window of seeing that regardless of the number of unit. 

I.e., say I'm working on unit 33 and wanna know how I am coming along. I can pay 1 credit for 30 minutes.

The amount or time can vary. I know a lot of users would enjoy this feature plus it opens up more revenue for the site/spending credits. I'm also open to alternative ideas.