Hey there, @sc0rp10n.py 
Thanks for reaching out. I recommend starting with this thread: Netlify function to trigger something in unity game engine as well as this search: Search results for 'unity' - Netlify Support Forums Let us know if this gets on the right track when it comes to technical work.
In terms of bandwidth, the best resource for you will be our Pricing Page. Our Pro Plan starts at 1TB /month, and then $55 per 100GB that follow.