So in my developer learning journey, this is my latest offering:
Vikings - based on physics games like Crush the Castle and Angry Birds (etc)
the game is free, with ads, or, if the IAP stuff decides to work, ad free at a tier 1 price. I'm hoping to add levels 49-84 by late April (plus fix the weapon reload glitch on iOS), and add the remainder of the levels about a month after.
Someone asked a bit back about a template to make this style of game. I started this from the Big Top Blaster template that comes with GS, and used a bunch of third party assets from various sources. Still waiting for Admob listings to sync so I can link my ad network.