Coinsolidation did the majority of the code work, if not all of it. I'm uncertain on that.
I created the new 0.9.4 codebase for GameCredits, and will be maintaining the core.
I am also creating a Game Payment Platform / API in conjunction with the Multi User Wallet API that Project Bitmark requires. This component will enable GMC to be adopted quickly by game companies / developers and users without them requiring any detailed knowledge of crypto currencies.
For the foreseeable future you can consider me one of the primary developers on GameCredits, in addition to Bitmark.