Gummy helped a lot in taking off the heat from Amiya. She died only once during the enitre run towards the end. But the last wave still proves to be a problem. When the fireballs start coming in from both sides coupled with all the large enemies, It's still too much. As soon as Yu went down, the fire went straight on to Thorns and blew up the whole group.
This is starting to feel silly... but do I need even MORE healing for Yu?