In response to Sir VG:
Bloodpool Act 1: Quick fall on the bridge actually loses time (you press against the bridge for several frames before moving forward again). Besides, I want that partial apple because it saves 16 frames at the end of the stage.
Marana Act 1: Yes, the wait is to let the first snake fall far enough to bypass it. A rather clever idea on Hotarubi's part (positioning yourself so that only the first snake falls). I had tried quick fall before but as you suspected I lose too much time due to taking two extra hits.
Northwall Act 1: This idea, on the other hand, worked, thus saving me about 20 frames. I've put up another SMV to just before Tanzra:
The reason I haven't bothered to do Tanzra again yet is because the Tanzra fight is rather hex unfriendly due to randomness and lots of lag, and I want to look at Hotarubi's stuff first. Hotarubi: thank you for the clever ideas. I will try to integrate them, and hopefully they will not affect my luck on bosses. I knew about the trick where you jump boost before getting hit because I saw it in your run, but I wasn't able to do it consistently. As you said, it is difficult to execute, but perhaps the example you just provided will help me figure out how to execute it consistently.