RNG got me on that skeleton in the first half, sadly. I also could've saved a bit of time on the boss kill if I didn't mess it up. I think could've saved about 3-4 seconds if I used the Mjolnir and did everything I wanted to do. I'm happy with this run, though.
Apparently, Volgarr's hitbox is slightly smaller during the plunging attack animation. That's one of the two main strats I use to skip one trap cycle. It's possible to do it without the plunging attack animation but you're much more likely to get hit on the way down.
The other strat is the particular way I roll and jump during the initial and middle portions of the second half. The initial jump gets you on top of the spear trap and second jump is faster than the spear trap triggering. Other than those two strats, it's just a lot of really specific positioning.
The game will come out the 6 august of this year, get ready to roll spear speedrunners!