I totally beat this on ninjakiwi, every map on hard, loved it! One small payment gets lots of permanent upgrades or do the daily challenges to get free monkey money to get game by game upgrades till you know what upgrades you like. Gets a 5 from me. Being able to lock the dartling gun in a fixed position is neat.
 "Bloons TD 5"){kind=icon}
 "Chronicles of Herenvale"){kind=icon}
 "Papa's Wingeria"){kind=icon}