The game has been fully tested on the mini including the older mini 2 (my main development device as an iPad mini 4). The main thing some people might notice is the unit sizes are reduced to the lower settings on this device as they are not as powerful as the newer iPads. This is similar to Windows where lower powered machines have to run on lower settings. This is a cosmetic difference (doesn't effect gameplay progression) however some people are used to higher settings on their high end gaming PC so noticed the lower unit numbers. We have different levels of graphics on the different devices this so you get a good experience on all devices new and old, however with the newer devices you can take advantage of the extra power to have a few more units on screen and slightly higher graphics. This avoids the issues some other iPad games have where the performance on older iPads have issues as the game only has one set of settings for all devices instead of scaling depending on the device. The UI was tested/designed for mini screens as well as larger ones so should be just as easy to use. Hopefully a few people can chime in with their views but I can tell you we tested the game and made sure it was enjoyable on every device we support both new and old.