pretty cool. Nice music in that video. I would still suggest to cut the video down to around 10 minutes, if you wanted some opinion.
Most of the sections were sped up with 4x or 8 x. I tried applying 20x but it just became a blur. I didn't crop any part so I can check the video for reference in the future. I wish it was shorter as well!
I dont want to say it is bad, not at all. I had the impression it could be just like one of these oldschool music-maple-videos, hence my suggestion. Dont speed it up more, anyway one could skip through. Nice reference!
If you mean that part against core blaze, he summoned those mobs upstairs to keep core blaze from spawning flying mobs. By doing so the whole party can just easily attack from the bottom and the whole stage becomes much easier.
This is exactly what i would do for Pap runs. it would stop any bombs spawning making 1v1 runs become extremely smooth. spawn manipulation can be done at multiple bosses and places.