I finally completed this level with all 20 trinkets! I died ≈1460 times.
Rating:
Originality: I don' think there's any level that's a sequel to the main game besides the conversion to player levels of the demakes. The teleporting system was original, not only for being a teleporting system, but because terminals telport Viridian. A modified Dimension VVVVVV, I don't think there's another level like this... Oh, and the trinket room.
Rating: 7/10
Level structure: I like levels with sub-levels that you can do at any order and trinkets in the overworld. Not to mention the teleporters. However, maybe it would be better for a shortcut to the part of the DT after the Polar Dimension after you activated all PSs (and get the ending screen with the scorees)?
Rating: 8/10
Story/Roomnames: I liked it. What happened before the main game was explained. And like the fact that this is a sequel to the game.

... Roomnames were normal, besiddes the fact that in the DT, it's always the same room name. Not to mention the Tetris reference, even if that isn't related to the story.
Rating: 9/10
Visual Design: Nothing interesting, but I never saw any 1-tile thin walls or floating spikes.
Rating: 8/10
Difficulty Balance: Note: You get a high rating for having medium difficulty and a low score for being too hard/easy. The hardest level besides The Final Level was Platform Arean, the 2nd hardest being the 4th I played (Life Factory?). I died more 180 times before I got the 19th trinket. I only died 34 times to get the 20th!

Also I think that at least ≈75 of the deaths were entering and exiting the DT for at least the 2nd time (to get the trinkets). I would say that the level is slightly hard in general.
Rating: 7/10
Glitch Amount: I felt like discounting something due to the fact that there Int. Scr., but I'm not suggesting you to remove it. There were some Viridian textboxes that were gray and the flip sound at the end of Platform Arena. In the last dialog, I suppose that

is the speaker of the 2nd text box? The textbox is cyan.
Rating: 8/10
Other Notes: I don't really understand what were you and avengah talking about in page 6 of this thread (considering that you have 15 replies/page). I never found the 21st trinket.
In the letter that Vita wrote, she said that there was something at the PS at the Platform Arena when there was nothing. Did I misread something?
At the ship, I think you need to warn that the terminal that teleports you to the Gravitron does that, so that you don't need to suicide.
You put me on the credits terminal!

I guess I already started playing v.1.1.... so I don't know why... well I already commented, so it can stay.
Total rating: 16

/20
Currently my 4th favorite level of those I completed, but I didn't complete many...
Also, this is my 500th post. How fitting!
EDIT: This was also the 500th post of the month in the whole forum.
Interesting!