Yes, Oppo A5s does have the support for the face unlock. Besides, it also has a fingerprint sensor.
Yes, you can play PUBG on Oppo A5s. We recommend you to buy 4GB RAM variant of Oppo A5s for the better gaming experience.
No. Oppo A5s does not have the front camera LED flash.
No. Oppo A5s does not have fast charging support.