A simple game does not have to mean a puzzle game. Think about how simple arcade games were in the early 1980s. In Pac-Man, all you did was move around, eating pellets and avoiding ghosts.
Rotato is a lot like Pac-Man. Players move around, collecting coins and avoiding stars. Only this game is simpler because you only move tapping the screen, but it is more difficult, because the playing field is much smaller…