Yeah, nearly possible. Thank you for the challenge idea.. Sorry if audio balancing is off this video.... I have been ill so re-recording audio? nahhhh. I am aware that the dual portal chamber e press can be skipped using an edge glitch, but it didnt seem to want to work due to my game version I assume. My bad
People mentioned:
Taful
https://www.youtube.com/watch?v=BBEVEiEQ4Q0
Music by:
Lena Raine
https://radicaldreamland.bandcamp.com/album/celeste-original-soundtrack
Extra links:
Portal speedrun doc for more detailed explanations
https://docs.google.com/document/d/1H7AHqiSTRzJE2xfqPCGBsUXZay1g9wdUfCbPXoz8S3c/
Specific tutorials mentioned in this video
https://www.youtube.com/watch?v=cpEHL-oHmm0
https://www.youtube.com/watch?v=wzP9rcM4rbs
Timestamps
00:00 Intro
1:00 Game start!
1:41 Dual Portal Device
4:32 Cube on Button
5:16 Chamber 17...
10:13 Parallel Universes
10:56 Chamber 18
12:03 Chamber 19
12:44 Loch Ness Monster
14:26 One Million Portal Bumps
16:05 Glados!!!
18:08 Outro