Early on, with my first app, I learned the power of responding to the community. Someone gave us a 1-star review of our game, complaining that it didn’t have a save feature.
I turned around the fix a couple days later and he immediately responded in his review, changed it to 5 stars, and said he would make sure all his friends bought it.
Listen to your users. They have valuable feedback. If you can make them part of the experience, they will have a personal stake in your project, and they’ll be more inclined to spread the word to all their friends.
Customers that complain the loudest are your biggest opportunities. It can be very disheartening to get an email from someone saying that they hate your game and demand their 99 cents back.
However, these people have a ton of passion, and most of the time they just want to be heard. If you can convince them that you actually care about what they think, and that you are trying your best to entertain them, oftentimes they will flip and use that passion to evangelize your product. In short, revere the community.