the back looks like a literal add-on case for the phone. They should have just made it swappable with other cases they could sell. Its a cheapo phone for that market so can't expect much.
Seen words budget phone.... I thought Merah Putih was calling it a mid grade device.
I don't know the market there and where a budget phone falls and where a mid grade device starts off.... but I don't remember any of those interview where they talked about going after the "budget" market.