Is it ok to do the windowed mode glitch where you drop an item several times and get negative weight and become very fast?

Lowering the resolution makes the game significantly brighter. It also reduces lag.

I just got into speedrunning this game and watched a few runs, I've seen that at the mara bossfight people get the special abilities like blink after bumping into mara and they use that to skip the fight. I tried it a couple times but I still don't get how to get the abilites on the bossfight. I haven't found any tutorials anywhere so if there's a video I don't know about maybe you could link it in the comments, thank you.