Undertale Yellow Full Flowey Fight OST (In-Game) 

None of the songs on this OST belong to me. All credit to the Undertale Yellow team.
I don't care if the video has a copyright claim, making money from other people's work and ruining the music experience with ads to get a couple of bucks isn't the case.
All sprites, effects and songs in this video belongs to the Undertale Yellow Team and Toby Fox
Timestamps:
0:00 - BEST FRIENDS FOREVER
4:05 - subconscious
5:10 - snow
6:50 - crescendo
7:33 - gotcha ;)
8:25 - AFTERLIFE (S1)
9:49 - specimen: patchworked
10:20 - AFTERLIFE (S2)
11:45 - specimen: organic
12:20 - AFTERLIFE (S3)
13:46 - specimen: clay
14:26 - AFTERLIFE (S4)
15:51 - specimen: paper
16:28 - AFTERLIFE (S5)
17:52 - specimen: polygonal
18:33 - AFTERLIFE (S6)
19:57 - specimen: mechanical