Bananocrop have developed two simple games that allow you to claim free Bananos for high scores, the top scores don't seem unattainable and these are the kind of games you can give your visiting nephew to play without worrying about offensive chat or inappropriate ads popping up (but remember to split the earnings if they play well ;) )

Bananoid

Objective - throw the bananas at the blocks before they reach the bottom. Submit your score(s) onto the leader board and if you finish in the top 3 for the day you'll get a payout.  (3 for winner, 2 for the second and 1 for third)
https://www.bananocrop.cc/bananoid/

Monkey Run

In this game you need to run and collect bananas along the way (using right, left and jump actions - or even up-left, up-right). As you number of collected bananas increases so does the speed of the game. Once again you'll submit you scores(s) to the daily scoreboard. I personally find this game easier to control than the previous.  https://www.bananocrop.cc/monkeerun/

Having only recently discovered Banano it's clear that the community is actively developing different means (and games) of obtaining them. If you play any other games let me know below :)

Thanks