We released 9th Dawn on Google Play in November of 2012. It originally cost $1.99. There are no ads or IAPs. The first few months it was making between $3-4k a month. Over time, that has dropped to a rather stable ~$1.5k a month. In early 2013, we released a free expansion, made the game available on iOS, and raised the price to $2.99, giving us a sizeable bump in sales (we made around $11k that month from the spike). Now across all stores, we have a relatively stable $1.5k-2k a month. We are planning on releasing the remake of the game across all platforms and on Steam here in a couple months, so we'll see where it goes from there. It didn't cost very much to develop, so as a side project that we never expected would generate more than a few hundred sales, we were quite pleased.