TapGap is a new game that I have just released for iPhone, and it's an experiment of sorts.
The game itself is a simple idea, you have to tap the screen when the line is inside the gap. Sounds easy, but it isn't. The gap randomly changes, and also the speed of the line increases.
However, unlike most of my applications, this one is completely free! Of course there are ads (one every 5 games as a minimum), but you can remove these with a super tiny IAP.
Anyway, check it out, and try to beat my score!