That sound good! I see what you mean with the ads and it's fine if you add them; but why not just charge a couple of bucks for the whole thing? Just my thought; it's your game so you do what you want. Good luck!
The problem is that not everyone has a credit card or a way to buy a game, and they may want to try it. Also, the ones that have a credit card will have the option to remove ads by paying a small fee, so it is pretty much the same thing.
