How to enable developer settings in android 5.1, instead of LOLLIPOP game
In vanilla AOSP builds, the Build number menu is the last one on the About phone panel. From your screenshot, your device instead has Software version in that location. Try the 5-7 clicks on this area. If that doesn't do anything, or produces a message like "No need, you are already a developer.", then I'm afraid your OEM has removed this ability and given you only minimal Developer options capability in the form of a USB debugging switch. The good part is that it's already enabled so at least you have that. 

Also, the Lollipop game that you found after multiple clicks on Android version is also what happens in normal AOSP devices.