yes, but to get the updates, we'll have to re-purchase the game... have you completely 100% made sure that all 60 levels are issue+bug free in the paid version before you pulled it? If not, and an issue pops up in the later levels... leaving those who paid for your game unable to complete it... you'll have no way of fixing it for them, except for telling them to download the free version, then pay for the levels they originally had issues with so that they can complete the game...
If you do have troubles completing the game we are providing a support page here http://www.savethefurries.com/support.html
If we are to make an update to the Freemium version which adds more features & levels, we'll make sure the players who purchased the Premium get a ticket to the upgrade too without the need to pay again what was bought originally. We have a design in place for this, but it will come to action only if needed as you understand it's not a simple process
We do care a lot about our players and fanbase, and make sure our games are released to the highest standards. Take my word for it; the people who bought the previous version will not be let down;