 Christian Donlan of Eurogamer wrote that the game is personal . He compared its core mechanics to handwriting and doodling , noting that the recurring stroke also captures the player 's " speed and hesitancy " . Donlan wrote that the game is " lots of kinds of puzzle games " as the player may read negative spacing or try to predict the motion of a reflected stroke , and compared the later stages to mazes or minefields . Shaun Musgrave of TouchArcade noted that the game 's difficulty increases around level 20 , where player precision is required , and considered this part a low point . He felt that the small margin of error in later levels lent towards frustration . Jared Nelson of the same website wrote that the game was uniquely suited for the touchscreen . 
