Gesture games are simple and very addictive. The game's mechanics are not complicated. A player has to tap at the preassigned part of a screen or make a correct gesture with his finger. The gesture can be single or multitouched. The player gets the points if the gesture or touch is correct. The more points he gets, the higher the speed of the gameplay becomes. That is the basic idea. Players like such type of games, they are fast and it is easy to understand their rules. They are wonderful time killers for young audiences (starting from kids) and also for older players.
A screenshot from a gesture game, Infinity Blade 2, from Chair Entertainment, which was a huge hit on the market providing addictive gameplay and advanced graphics
It is very important for a simple gesture game to be quite elementary in development. If the gestures are not complicated (a player only needs to tap on specific zones of a screen), there is no need of complex algorithms and advanced code...