I just finished porting a game originally written in Objective-C with Cocos2d to C# with CocosSharp. Since I don't have any OSX or iOS devices anymore it has just been ported to the Android and UWP platform.
The Android version was pretty straight forward, but some work needed to be done for UWP. So if you plan to create a game with CocosSharp for UWP this post could be interesting for you.
It doesn't seem that there is someone actively working on the UWP version of CocosSharp at the moment, so I just got the latest version and fixed and added the stuff that was need for my project. Here is a list of those things:
I created a pull request for some of those changes, but you can also just clone my repository from https://github.com/Andy9FromSpace/CocosSharp and follow the steps in the README. Make sure you switch to branch "improvements".
And if you are interested in the outcome, you can check it out on Google Play (https://play.google.com/store/apps/details?id=ch.neonlabs.toadsworld.android) or in the Windows Store (https://www.microsoft.com/store/apps/9nblggh42cq8)