That's the minimum requirement. It should work on 4.4.2, but apps are not always compatible with all Android devices. It's more likely that your phone isn't actually compatible with that app. There can be a number of reasons for incompatibility (such as screen resolution or chipset incompatibility), but it's not often that you can find out exactly why it's incompatible. I'm not sure if there's much you can do about this. Some might suggest looking for the apk installer file on the web and manually installing it, but this can be risky, since sites where you can find apk files are not well-regulated, and can put you at higher risk for malware.