Right so I dug through KS and picked out the levels that I remember because of how good they were and then checked which ones weren't on the archive or posted here.
The Hunt -Farik
Marine -Jerom
Knytt 8bits -Jerom
Too Much Soda -KG
Jolio 1 -Noi
Jolio 2 -Noi
Creepy Dinosaurs -Pesty
Remembrance -Si
Revelation -Si
A Kick in the Nuts -TheRealTJ
Cube (Parts 1-6) -TheRealTJ
(Of course, both Si's and Noi's levels are the first two parts of trilogies, sadly unfinished. And Jerom said he was going to make major changes to/expand upon Marine, and posted some very promising screenshots.)
Put together, these levels are very large, and uploading them all will take time. I've gotten started by uploading Knytt 8bits (http://knyttlevels.com/levels/Jerom%20-%20Knytt%208bits%20v2.knytt.bin) and Creepy Dinosaurs (http://knyttlevels.com/levels/Pesty%20-%20Creepy%20Dinosaurs.knytt.bin) to the archive. (And trying and failing to upload A Kick in the Nuts.)
If anyone else who has these levels could help upload them to the archive that'd be great.