Good morning,
I'd like to offer my help for your project. Actually it looks like I would be able to make great work for you, as I'm familiar with Google Play Services plugin for Unity and I've been using it during my last game project. So I can assure I have up to date knowledge about this plugin. My understanding is you would need to save the game state on Google Cloud, right? (actually the saved data are stored on user's Google Drive). It's exactly what I implemented for my last Android game made in Unity.
If you would like to choose my offer, I think this is general plan:
*I'd like to review the project, we could clarify what are exact requirements. We could use text messenger or skype call. I can be flexible here.
*If we find out that all targets are clear, I'll start to work on the project after your advance payment.
*I think working on this shouldn't take more than 3 days. There is a chance I'll be able to complete the work faster. It depends on your project complexity. I can see you're from the US - I don't expect contact issues, especially because I go sleeping late (about 2-3 am in Poland)
I'm looking forward your response.
Thank you and regards,
Damian Zdunek
P.S. You could see the 5x5 board game in my portfolio. However there is just a Polish version of the game and I believe it's not available for the US. Anyway, if you would be interested in my offer, I could try to find a way to present you the results of my work.