You can choose to cancel your gamehouse+ subscription anytime and this is done through the app store directly. Please see the steps below:
 
  1. Open Settings
  2. Tap your name, then tap 'Subscriptions'
  3. Tap the subscription that you want to manage
  4. Tap 'Cancel Subscription'
If you don't see 'Subscriptions' in the Settings, continue with the following:
  1. Tap 'iTunes & App Store'
  2. Tap your Apple ID (which is usually your email address)
  3. Tap View Apple ID
  4. Sign in, scroll down to Subscriptions, then tap Subscriptions
In case you don't see the option to 'Cancel Subscription', then your subscription is already canceled and won't renew.