Got it a couple of weeks ago and I've been playing Slash on Novice, getting up to the 5th level. I wanted to 1CC it before moving to Normal, but I'm afraid I'm getting too aquainted to the fast refill rate of energy on Novice, so I'd rather switch now.
I suppose that's one of the reasons why training is not available on Novice.
Anyway, this is my second danmaku experiencie and I'm having a blast!