I made a few small bug fixes and released an update today, but now the Compatibility has randomly changed to iPhone 5s or later and I have no idea why. Previously it worked on any iOS 8.0+ device, and the changes I made were very small bug fixes.
After looking at the compatibility reference there are only two things that are iPhone 5s+, and that's 'metal' and 'opengles-3'. I don't know what these are and how I could have accidentally used them? In my info.plist only "armv7" is in "Required device capabilities".