at one point i got 250 runes and +5 award. it was after an 8 win streak. i lost the next match and it went back to 50, so figured its a progressive win streak thing, only it's not. i then got up to a 13 win streak and every match net me 50 runes, so i really have no clue the randomness.
i wish they'd add a win streak award since otherwise it's pointless to have it even record how many wins we've had in a row maybe it's something they plan on adding in the future
It appears that the game gives you additional rewards if you're outmatched level-wise, increasing your Runes and Points rewards by 50/1 respectively. I've gotten up to 250 from a single match. I don't really pay much attention to life totals but some of the times I remember that happening is when my opponent outlevels me. It will require some testing (and some more paying attention to my opponent's levels)
It's just 50 for every level you're outmatched (or 50 if you're not outmatched). I'm pretty sure you can't get matched against someone 6+ levels above you, but if you can, the reward caps out at 250 and 5.
It's been very consistent for me at level 10. I get 100 for 12, 150 for 13, 200 for 14, and 250 for 15. 50 for 11 or less.
Were you maybe not healed to full?