Google+ gets another 30-day exclusive in the form of Zombinis, Eastside Games’ collecting-and-battle game featuring exploding zombie animals with detachable body parts.

This is a bit different than the original plans Eastside revealed to us last July. At that time, the developer said it was planning to launch the game on Facebook and its own site, with G+ listed as a potential platform.

“We are still actively working on launching Zombinis as a stand alone experience, but we felt that we first needed to work on some core mechanics in Zombinis to ensure our players were having a great experience,”  said Eastside Co-founder Josh Nilson when asked about the change. “We decided to extend our closed Beta and really work and improve the game, to focus more on community driven design. Rest assured a stand alone is still in the plan.”

Google+ has been steadily adding games to its network, but it’s difficult to gauge just what kind of metrics developers can expect to see on the platform. We’ve heard that, compared to Facebook, retention is an issue and player conversion is nowhere near as strong as what many developers are used to. Clearly something about the platform appeals, however, as this is the fourth 30-day exclusive launch title hitting G+ after Digital Chocolate’s Gangs of Boomtown, Kabam’s The Godfather: Five Families and  Plarium’s Pirates: Tides of Fortune. The recently-announced Google Play app platform may also play a role in encouraging developers to take a risk on G+.

Nilson says part of the appeal is in the small selection of games currently available for the platform. “For an indie studio this means you can get discoverability,” he says. “We have had success on Facebook and also on the open web and see potential in G+. We want to be able to contribute to G+’s success, more platforms in the social space would be great for the game industry, both for developers and also for players.”