Garga definitely comes a lot more often than 1/1000 spins.
It's a great game and my favorite slot. It has decent potential, 15x pink isn't that hard, but it doesn't rip nearly as fast as some other PnG grid slots like Wild Frames, Honey Rush, or Moon Princess, all of which I also like. (I think volatility for Reactoonz is rated as High by PnG, while the others are Very High) You can definitely see patterns if you play long enough, but the wins are still way more unpredictable (in a good way) than Wild Frames or Honey Rush, where you know how good the feature will be long before it actually plays out.