I would consider adding more sounds on a regular or semi-regular basis and promoting them as appropriate. For example, you could have a $2 Valentine's pack, which is cheaper than ANY Valentine's card option out there and packs some novelty value.<p>You have some way of reaching current users of the app, right? (It <i>is</i> for messaging, after all.) Spend an hour or two and a small amount of money creating a Valentine Pack (preferably something with "if you receive this, you'll want to show it to your friends" value -- "I love you" not so much, but something quirky/whimsical/hilarious probably), ping all your users with a free sample.<p>("This is a Welfare Valentine, for people who don't have somebody to give them a real Valentine. Happy Valentine's Day, you love-lorn person, you. Say, know someone who should be getting a REAL Valentine? We'll hook you up for $1.99, or alternately, you can send them a Welfare Valentine for free.")
I can't get enough of these types of blog posts. The app store is a fascinating study of marketing, economics and good ol' bootstrapping. Good luck in your endeavors and thanks for sharing.
> It was also pretty fun to create.<p>I like how you described the rollercoaster of emotions that goes into making an app (from initial excitement to happiness having delivered something you are proud of).