Hello @karen3g2s and thank you for this review! I've updated app recently, added friendly educational "welcome" levels explaining an overall goal of the game and core gameplay. Also, ads is less annoying now. It appears only after few turns, not a time based as you mentioned. Also, ads has been removed from a set of first levels. All these changes increased the length of game session and increased a number of sessions per user. Thank you once again!
CRXExtractor Band