I dont even think Ludei even updated the C2 plugin to support Google achievement/leaderboard system. Hell, there's still alot of issues that has even been addressed like the blinking Ludei ,logo in your exported Android games. Their support is trash when it comes to communicating with C2 devs.
Yes, it kinda seems they are slowly forgetting C2 users. They used to answer questions very fast through the developer e-mail, but that changed in October or so. Now they just direct you to their forums where they do not seem to react to anything.
The future with C2 and iOS does not seem too rosy because of this.
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I am happy we have new options for Android, tho!