Please help – Guns of Boom Review

Really like this game but I trues to update it when I opened the game it said I needed to update it and I clicked update and it brought me to the AppStore to update it but there’s no button to update it, it only lets me open the game I can’t up update it and I checked all my updates and guns of boom isn’t an option to update it so please help me
Review by WasPoppinJimbo on Guns of Boom.