The auto-update feature in your App Store may have defaulted back to 'disabled'.
This needs action on your part to to re-enable it, to ensure that games and other Apps are regularly updated with the latest in level episodes, bug fixes and forthcoming features.
This also means that your notifications for updates won't show as available on your App Store icon, until you accept the Terms and Conditions in the new update.
To resolve this is very easy and only needs you to take a few steps :
Taking this step will mean you don't need to regularly visit the App Store Updates screen to manually confirm the download of your App updates.
It looks like you're new here. If you want to get involved, click one of these buttons!