Kind of a mixed bag for me. On the one hand it suffers from what every fan-made portal puzzles suffer: they're either too primitive or too overcomplicated. As a result, the game varies between being too simple and being extremely tedious and clunky. The plot is also messy, it relies too much on repeating the Portal 2 formula, but the pacing is completely off, you spend too long in the first act and rush through the other two, and the ending is... yeah. And in terms of originality, though it may be not too honest to ask a fan made mod to reinvent the game but after Portal Reloaded the experience feels lacking.
On the other hand, the voice acting is really fun and well done, I enjoyed the part of the game with Emilia specifically. I also really enjoyed the locations, especially the surface world. It looks really refreshing for a Portal game. Music also fits the game very well and I could easily mistake it for the original Portal soundtracks. And at the end of a day it's still a game with portals and it's hard to ruin that.

This game is such a product of its time. It falls perfectly in this category of late 7th generation AAA games, where everything is gritty and dark and the characters are in dire situations or struggle more than usual. They are very "serious" (because games are serious now), very "cinematic",  use all these camera effects, absolutely unnecessary long cutscenes and (of course) QTEs. Max Payne 3, Hitman Absolution, Bioshock Infinite, The Last of Us etc etc. And the problem is that all these games do these things reeeeeally badly and unnecessarily. Long cutscenes work only if the story is interesting and characters are not just action guys (and even then there's time and place for them), the ugly shaky-cam aesthetic peaked in Kane & Lynch 2, and QTEs are shit, oh my God, you don't need them anywhere but in Telltale or Quantic Dream games. But all that aside, the game is pretty good, a bit clunky at times and a bit over the top, but I enjoyed it. Platforming still doesn't really fit this kind of game, but it was alright.

Probably the best indie 3D platformer puzzle first person shooter visual novel game I've played.
The gameplay is amazing, it feels and controls perfectly and the effects especially by the end of the game are just pure fun. It's easy to get the hang of, but it still feels rewarding when you discover some unusual solutions. Level design is insane and despite extremely rapid pace you (almost) never get confused. Visuals are great, soundtrack is great. Everything is filled to the brim with adrenaline, fun and goofiness.
Yeah the writing is cringe sometimes and the characters are cliche, but it doesn't annoy me and even fits the game really well, because it's silly and innocent (like in Night in the Woods and not like in David Cage's games) and full of sincere nostalgia and love for the pop culture. Plus the voice acting is perfect for these characters and the visual novel elements are well executed and sometimes even feel a bit satirical.
Actually the game is full of little nostalgic pieces, all the stuff from 00s games like the ghost playback, prizes in secret places, leaderboards, hub zone, medals, pushing player to replay levels hundreds of times... Parts of the game also remind me of CS surf maps and other parts of more recent Clustertruck.
This is such a fun game and even after completion I want to replay lots of its moments.

It looks great and the concept is cool and it's a shame it was wasted on such an utter shit game. It runs like shit, freezes and crashes every 5-10 minutes (sorry, but if you cant optimize your game you shouldn't even make it), the autosave system is awful and inconvenient (especially considering the crashes), first-person platforming is already a bad concept, but it gets even worse with shitty movement control and excessive difficulty in some parts, which is mostly due to bad game design. Just read BLAME! instead I guess, or hope that someone else makes a better game.