I Won't go to the fact it was slow or fast, rather, i'd like to give my absolute opinion about the copycat "Burtjack", I Ignore quite the situation about him and how he proceed, but judging by all his contents :
he takes the GP Team as a inspiration, but to a extend no one else had ever reached, and honestly, from the regular point of view, he's a "véritable" and true fan with a very fierce motivation to gain experiences and being able to walk amongs the ones he admires.
So far i don't think this troubled anyone (of course there are still some exceptions, i am obviously one of them) but the "Inspiration" taken are basically also recreated from the original author, that's mean, since it's a movie for Gibb50 and with Gibb50's sprites, turned out that for him, the best solution would have to switch Kelzad² to Gibb50², which results to a Animation style change, moreover a Sprites changes (which enhance the suddent change)
This is why all the first minute of this movie was generally very slow, judging from the end, He puts all his efforts into his Movies and have most likely didn't (or could i say never) Tested out this new style before using it as definitive, You may think that doing test is for the lazy who can't do a full movie (which i actually part-true), But it's actually very essential, Tests are means to try-out and experiment the contents, Thanks to your rushed-copy, you managed to make half the movie technically trash.
Althought, the strong point is your replica, in terms of Quality in Visuals, there are no problem on it and it's set rather correctly, i'm still unable to congratulate you the fact that you own almost no contents present in this movie, it's a good thing that your angle fails are barely noticeable such as the Box when he's covering.
More unfortunate : as far as i know, The GP members are still more or less trying to make a storyline and set their protagonists a particular goal they need to succeed, turns out you didn't thought any shit, you might say 'oh that's just a birthday thing, no need to go that deep', But at this point, it's no exaggeration to say that's 95% of the birthday movies are trash.
Choreography... sorry but your way and technic of producing a scene in general has no value whatsoever, The Agents are merely here in order to get Killed because they cannot trigger the gun within 5 secondes which is more than ridiculous, at best, you eventually respected the order of the Ranked opponents (Upgraded agents) and attempted to slightly making things difficult (which failed, since even the best agents in this movie are not strategic)
I'm even more sad to see that you make him use his teleportation in moments where he just "can't dodge" and counter-attack from getting closer to him with a suddent pop! This is what Gibb50 usually do and you never once attempted to change the power's uses, that's a regular issue to be blocked in a scene and telling yourself "OMG WAT TO DO?", but to solve it with teleportation is just lame, but i won't really blame you for that since you're still unable to generate your own ideals, this will comes out soon enough.
Please, just for once, be yourself.