Did not enjoy this mod at all, about the only positives I have are the cool cube assemblers and the concept itself.
!!!WARNING RANT INCOMING!!!
It feels like it could have been such a cool mod but the concept is ruined by terrible level design, you barely use the portal gun at all and it would almost have been better to distance itself from portal by making it purely time puzzle focused.
So many puzzles are ruined by just pure tedium added to them, a puzzle where you drop 3 cubes to yourself, why not just 1 or 2, you are proving you can do it, why do you have to waste extra time? Similarly the first fizzler floor level, get the cube across slowly passing it to yourself, just to get a different cube and have to do it all again in reverse, nothing changed, it isnt harder the second time around, it could easily have been fixed but there just seems to be a degree of tedious repetition added to the levels after the intro tutorials.
As mentioned above the fizzler floor levels where just torture, punishing and boring.
There are so many terrible and frankly bizarre design choices that left me wondering had it been playtested at all, like the ridiculous part where you have to press use on a gramaphone, I know a lot of people got stuck and gave up there, I just spam use on stuff and was lucky, which leads to the totally random Borealis???
There is a room with sphere buttons etc on the roof, I spent ages figuring out how to get them up there, turns out, you just bring the cube near it and it sort of just gets sucked to the roof cause who cares about gravity and consistency.
The new square buttons also look far too similar to the cube buttons which meant I pretty much had to try them to see if standing worked for them.
The "Story" might as well not have been added it was so half done.
Detailing, overall it was passable and just average in the main chambers, again, a wild decision as mentioned above to have portal surfaces that are actually lights is weird. They used the same awful Behind the Scenes skybox over and over, so it was easy to spot the nodraw in the ceiling, missing sides to metal columns and the huge magnified catwalks and vactubes 16 times their size looked pathetic, it was also incredibly lazy to do so.
In some areas like the random Borealis room the detailing was atrocious, misaligned textures everywhere and barely a prop in the place, just big blocky rooms.
Then it just sort of ends, and to be honest, you feel glad its brief runtime is over.
TL:DR Great Concept, used terribly, do not recommend 