Low memory logs are generated when a device is running low on memory. They aren't crash logs but just informal log files that tell quite the obvious. Most likely you have iPod Touch 4th generation as it has retina display (which requires more memory) but only half of memory that you can find from iPhone 4. When running low on memory, iOS tries to close down applications in the background (like Safari etc.) among other things and a log file is created.

If Shadow Cities runs out of memory, a crash log named 'shadowcities-[date]' is generated and that's the most useful log file for us, although feel free to attach LowMemory logs. They can be helpful too especially if crashes seem related to low memory.

Shadow Cities consumes memory quite a lot and most likely low memory is related to running Shadow Cities. We've found couple spots in the code where client may become unstable during low memory conditions and will do our best to get those fixed to the next update.