For most developers, the ride just begins when you see your first app go up for sale. Then comes post-launch marketing (keeping up the buzz), updates, future DLC or other content (paid or free), localization, planning and development of your next app(s), building your brand/app community, and, of course, fixes to problems you never knew about.
One of the biggest obstacles post-launch (and one that can severely drain momentum) is bugs that are caught by your new customers, who then leave feedback on iTunes that reduce the overall rating and lead to less than stellar reviews. As has been mentioned before, it's critical to squash the crash bugs, but a lot of other things can go wrong with your app, or things that people will otherwise leave feedback on. How best to assimilate the feedback and then set priorities to take action is something every developer should know.
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