I was watching Ivif run and I notice that the star counter does not drop every time he uses some skill, it looks like a type of hack and I wanted to ask if it was allowed or how he does not run out of stars, already I'm interested in speedruning this game and I found Ivif run weird

thanks, is there any guide on how to use the glitch to be able to do it in my run?

It would be good if you put it in guides, so people are encouraged to run