how did i do this without metal cat in 1*

how is it possible that a single cat can make this level go from me not even dealing one fifth of the boss' health to essentially beating it with 8 units (i only used jiangshi and rock after luza died)

anyways what should i get from my plat ticket, i was thinking either kai at 1A or gravi at 8A, though gravi would have to wait as i have a good-luck ebisu at 2A and sirius at 6A in ultra selection that i also want to claim first

or should i try and find another way to get a plat ticket (i have 7 shards currently so missing 3) and claim both

seed is 3538009439 if you're wondering