Tichnickle,
In less than 10 minutes of testing, I was also able to beat you on the first 3 enemies of the game. I'm not sure if it's as fast as Spike's, but it's close. (My scream input does occur on frame 1737 which appears the same a Spike's image above, but I'm not sure if the video he shared is from that particular input).
Both Spike and I attack the left two enemies first. I believe this yields a faster time due to death animation timing with the game only having to process 1 enemy on the 2nd scream...but that's speculation and I can't (currently) prove it.
Doing it this way requires walking right further before doing the first scream, hence the attack not happening until frame 1737.
I can't comment on the glider as I haven't tested that far (nor am I particularly interested in doing so).
Another question: I know you've at least tested one other character; but have you tested ALL the other characters to confirm that this is indeed the best character to use for the game?
TASing is not about just doing something fast and quickly submitting.
It requires doing something, then doing something else, then something else, then something else, and so on...until you've tested every possibility you can imagine to see which is actually fastest. It's a time-consuming process and not something that typically occurs in a short span of time. I'm not trying to discourage you...simply trying to get you to slow down and pay more attention to the quality of what you're submitting instead of rushing to do submissions as quickly as possible.
I'll reiterate what EZGames69 warned earlier: If you continue to submit runs that are noticeably sub-optimal, you'll put yourself at risk of being banned from submitting.
I'd encourage you to cancel this submission and once again re-evaluate it. Spend more time with it. Try different methods...even actions that may not initially seem faster can ultimately yield a better overall time as the above situation proves -- delaying the first scream and changing it's direction actually yields a faster time to moving onward.