From Mark O'connell:

With 1.3 we added in an error reporting system that sends mini crash dumps to us to enable us to track down and fix more crashes.

An example of how this system is helpful is that thanks to these dumps we discovered that one problem was causing 25% of all crashes, far higher than any other cause. The specific problem was to do with system memory trying to allocate a texture in the sprite cache. This system has now been changed to use a lot less memory so the frequency of this crash happening has been massively reduced.

So with these minidumps we can get a lot more information on crashes people get, and they also allow us to focus on the biggest crash courses and fix those problems to provide you with a more stable game.