This map was hard. I don't know if this is the end of the game or not since the credits are next to it, but there still are 4 levels remaining.
The game: https://store.steampowered.com/app/97...
The playlist of all their songs:    • [Official] A Dance of Fire and Ice OST  


Time stamps:
00:00 | 6-1 Good Luck
00:10 | 6-2 Inverse Kinks
00:20 | 6-3 Fun With Irregular Time
00:35 | 6-4 SSSSSS Returns
00:53 | 6-X Pulse