So how exactly does move to SD card work? I'm on a xperia device with lollipop. Let's say I have 5 GB free space according to the settings. I install XCOM and have 2 GB free space left. I move it to SD card and I still have only 2 GB space left while my SD card has also less space left. Also some other big games should be on the external card but there is much less space left than there should be. I'm aware that not all data is moved but according to the settings it's just a couple of MB that should be left in the internal storage.
http://imgur.com/a/D0VGS