Yes, Vivo V5s 64GB comes with front camera LED flash.
Yes, you can get EMI on a debit card, conditionally, your card is eligible for it. Check with your bank (ICICI & AXIS) if your debit card is eligible or not.
Vivo V5s is not much heavy. Despite of having 5.5 Inch display and bigger battery, the phone weighs just about 154 grams.
Yes, Vivo V5s does have eye protection mode, too.