How I Went From 0 to $50k on the App Store(s)
entrelife.com
entrelife.com
I mentioned it a bit in the article, but from my experience and that of many devs I've talked with the best money spent is on design. Put the money you planned on spending on marketing into the best designer you can afford.
Are you considering raising the price on Debt Snowball+? It seems like it gives enough value to support a $1.99 or $2.99 price without cutting sales so much that you'd earn less.
Have you thought about packing some more keywords into the app name, like "Debt Snowball+ - Pay off your debt faster"? Maybe that would help climb above the other apps in that niche.
I don't know if you considered "envelope" and "envelopes" as keywords. Not sure how much traffic they get, but it looks like your competitors use them.
I like the screenshot graphics. Hadn't thought of tilting the phone like that.
I like the targeting of micro niches separately by having essentially the same core GPS app built and marketed for different purposes.
EDIT: Just finished reading the whole thing and I have some additional questions:
You don't talk much about customer development, at least not directly. Does this mean that in your experience you've found that reviews in the App Store are a good enough proxy for soliciting customer feedback? Or did you just leave that part out for one reason or another?
If I wanted to I could probably redo the graphics now and actually make significantly more. There are a few apps that do the same thing that make some real money. I just did this a test when I was first learning about the app store and I don't find it to be interesting so haven't put any time or money into it. I just find it interesting that it still gets downloaded every day and makes enough money in a month for a decent meal :-)
If you have something really broken it will show up in the reviews pretty quickly, otherwise plenty of people email me letting me know what they'd like to see in future updates.