I gave it a few goes, It was hard, I lost the first round about 5 times. I didn't notice the health go up of any of the battlers but I managed to get a good run and managed to save all of them. So I guess they were being healed. Had to focus on that little rune bar pretty hard.
The only bug I noticed was that the runes sometimes overlapped but nothing game breaking
It was fun, it was hard though and I'd probably suggest making the first level a little easier or a little slower maybe and build up to speed.
Art wise it was good, and the effect of stuffing up the runes is good. Seemed cohesive to me