Very nice work Dave - one thing thats probably a more interesting question - can you make a living on that? Making many small apps? Have also been toying with an idea to start doing apps for a while now and rather than do a major idea, instead do many small apps. Like for example if 1 app brings 100$ per month - then making 20 could make 2000$ and so on - but does 1 app make 100$ on average at all?
I know of a person (via one of the local game dev groups I was part of in a previous city I lived in) that would just crap out a "new" app every couple of days by making a super simple game (like infinite runner) and then get some artist in Romania to reskin it 4-5 different ways for $10/hour, then SEO the title for popular keywords (names like "Runner Game for boys and girls with cute bunny! Christmas edition!").
If you have an idea for a genuinely useful app or good game, something you would enjoy working on and can imagine others enjoy using, then go for it. But don't do shotgun-dev of shit app. We have enough of those already.