All right, gave it another few listens, and I've got almost all the music and the whole plot save the very end. The whole first half up to the Squddles interlude uses Dave Fucking Owns At This Game's drum track and the main piano bassline of Sburban Jungle, so those are always assumed. If I mention them, it's because their main musical parts got especially noticeable. If I don't mention anything, it's an original addition as best I can tell.
- (DFOATG, then a bit of SJ) Dave is trying to get to the medium and failing because seppucrow knocks him down.
- (Beatdown) Bro CUTS THE METEOR IN HALF WHILE FUCKING STANDING ON IT, thus saving Dave...
- (Mutiny) ...who catches the egg and lands on the hoverboard (he enters the medium AFTER the meteors hit, weirdly).
- (Showtime) Present Dave is surrounded in the medium with all his sweet gear, the gate above him and enemies around him.
- (Contention) Mom and Dad (and presumably Gramps) are on a ship heading for Skaia, preparing to fight with guns and cake.
- (Black) Jack kills everyone but WV...
- (Sburban Jungle) ...then uses his ring to kill everyone else too. (purple body might be a badly wounded WV)
- (Explore) The Reckoning starts, and all the babies are packed away onto meteors (yes Dave is on Maplehoof)
- Jack kills a bunch of planes and stuff, then CD gives him the white staff...
- (Hardlyquinn, I think) which he uses to send the asteroids
- (no idea to either of these, might be original) DD creates Bec from the MEOW code, but doesn't appear to send him back right away. AR watches nervously.
- (a whole lot of stuff, see below) Jade sleeps while Dream Jade roams Prospit. The White Queen prepares to leave.
- (the high bits are reminiscent of Doctor) Jack shows up. Everyone dies, and he cuts the satellite loose.
- (Atomyk Ebonpyre) Jack and Bro fight on a giant turntable above The Land of Heat and Clockwork. It's a standstill, so Bro smashes his sword down and jumps off as Jack takes one last swing at him. The platform looks like it is about to explode with Jack on it (who we don't see again in the flash)
- SQUIDDLE-E-EEEE, SQUIDDLE-E-EEE, I JUST HAD A BRAIN SHOCK ANEURYSM (??)
- (Dave Fucking Owns At This Game in full + Beatdown from here on out) Dream John is falling towards Skaia, still asleep. Everything is falling too. Jade catches him and wakes him up with difficulty, but her Dream self is killed.
- The dreambot explodes atop Jade's tower's secondary tower bit. Jade falls from the tower. Bec does not appear to catch her, judging by the end bit.
- Portals open up all over Skaia to deflect the meteors as Prospit continues to fall
- Rose and Dave are fighting, and look to their portals (I think they change from receiving to spewing?). Rose blows something up at the portal (a meteor? dunno?) then flies off. Looks like Dave goes through his.
- Bec watches as the massivest meteor falls towards Jade Island
I never found a spot for where Dissension, Aggreive, or Harlequin fit in, though I could've easily made a mistake. The Prospit bit before Jack shows up reminds me of Ballad of Awakening, Skies of Skaia, and Endless Climb. Not sure exactly what it is.
So some stuff I'm curious about: If Bec is basically made of epic magicks, and Jade prototyped Bec, would Jack then become epic magicks? Or if Jade prototyped something weaksauce, would that weaken Jack? Because he appears to be the only thing left standing that can be prototyped, assuming Jade's ring is destroyed.