Great Time Trio v3.0.4 Mini Patch.
(This patch here only fixes the fact that if you go through boss rush mode the game thinks you're always in boss rush mode, even though it changes the fight.)
Next up
GUARDIAN
[GTT] Great Time Villains Encore - Attacks #3
Frisk 
The Trio of H.E.L.L ENCORE
Muffet - Day 2 #Joltober25 #Spider
BLACK KNIFE
Some Fight Arts (As the title says, these are some of the cover arts for the fights, not 100% finished yet but almost, and also some old arts were changed a little, in the case of the old MEGALOVANIA and TRIO OF HELL ENCORE.)
#Undertale10 I never played Undertale besides the Demo of it (and only played a little bit of chapter I of Deltarune).
But it was so everywhere online that I ended up learning about most of it from gameplay videos and even ended up watching fan-animations
[GTT] Great Time Villains Encore - Attacks #2