There's also a comment talking about how to monetise the game "properly" which gives advice about some reasonably ghastly monetisation techniques:
> At the very least he should have added a interstitial upon opening the game, and maybe one everytime the game becomes active. He should have included a retry button.
> There should have been a more games & free game button. He could have added a remove ads in-app purchase, and made it so that you can only get rid of the ads for ‘x’ amount of time before you have to buy again.
> He could have provided upgrades like buying shields and/or lifes so you can get further, getting rid of peoples frustration.