No. Redmi Y2 does not have the Gorilla Glass protection.
No. Redmi Y2 is not a waterproof mobile phone.
Yes, Redmi Y2 does have the Mi remote.
Yes, Redmi Y2 does have the IR blaster.
No. You can not record slow-motion video with Redmi Y2.
The Xiaomi Redmi Y2 is a slightly better attempt at a selfie-focused smartphone than the model it replaces. It has proven hardware that is capable of delivering a smooth user experience, plus MIUI 9.5 which has a lot of added features.