goGame games are free to play, but you can buy in-game currency to progress faster. In-game currency is purchased with real money using either Google Play or App Store.

To set restrictions on your device, please refer to the link:
For Android, https://support.google.com/googleplay/answer/1626831?hl=en
For iOS, https://support.apple.com/en-us/HT204396

If you’d like to continue making in-app purchases, set the device to require your password every time you make a purchase (select “Immediately”) or every fifteen minutes.