The selling number was very low at the beginning. One of the reasons was because I made a brainless mistake in the submission. When filling the submission form, I chose “Entertainment” as the primary category, and “Games” as secondary. I did not know AppStore entirely ignored the secondary category, and our game had not appeared at the Games section at all. I noticed that immediately and submitted an update to switch the category. But we already lost our first chance to build the visibility.
That was bad but not the worst. There were some players already known our game from the forum. They downloaded the game immediately, and gave us feedback that we had never expected. They complained that some puzzles could not be solved, including one of the entry level puzzles.