QuickHit is essentially a basic shooting game, but differentiated from other such games by its levels. The levels are Qt plug-ins which are loaded during QuickHit startup. Different levels are shown in the application's main menu. Levels can have different sounds, graphics, and level QML files. A common characteristic for all levels is that your ship is at the bottom of the screen and shoots upwards.
This Qt example application demonstrates Qt Quick as a game platform.