I am not good in Linux, but with Code: chattr -i /opt/alien/data/app/com.android.vending-1.apk you again allow changes in com.android.vending-1.apk, and you are able to remove or phone is able to update it. Those who know better, can correct me. :-)
chattr -i /opt/alien/data/app/com.android.vending-1.apk
chattr +i /opt/alien/data/app/com.android.vending-1.apk