An in game progression would be good at the same time. like some balls or pins that you could potentially unlock without paying for them. not saying take away the hard cash shop, (I recognize that's needed for just a free game) but some type of development would help with https://mylesqtwlg.blogcudinti.com/28772456/the-smart-trick-of-free-online-game-that-no-one-is-discussing