Hey there,
If you cancel your pro subscription, you won't be able to play games you've claimed.
However, when you resubscribe, all games you've claimed should appear in your home screen again, and you will be able to play them again.
-- Baldy
I am no Google official. My messages and opinions are my own, and should not be used to judge Google or their products. Silver and gold Guides are independent volunteers that like to help out on the forums.