Quick firecape help (1 def)?

I have tried fight caves 4 times now but keep failing around wave 45. No guides cover how to beat the 90 + 360 rounds and my computer is too slow to load youtube effectively. I either take massive damage from the 90, or run around desperately trying to trap something. how do i beat these rounds on a 1 def pure?

 

You have to tank the 90s on those rounds or at least try to trap them but it's usually not worth it. Pures usually bring purple sweets which are a stackable food so that they can take high amounts of damage from 90s.