This is a great mod that captures most of Portal 2's essence, while still having some nice and unique things for itself.

The maps and levels are very nice and varied, and really has a lot of Portal 2's quality. The puzzles are fun and challenging, though there are a few that stand out from the rest for being harder. Also, throughout the sections between puzzles, and in some puzzles as well, I feel like there's a pretty big lack of direction. You'll be looking all around you for that one portal surface a lot, and can get a bit annoying.

The music is pretty good. Unique and distinct from Portal 2's soundtrack, but some of the tracks can get really repetitive in those puzzles you spend more time on.

The characters are okay. Cave Johnson's lines capture his character perfectly, Mel has a nice design and Virgil can get pretty funny at times. I'm not happy with Virgil's voice actor though, his foreign accent drives me nuts. And the part where you wake up and Virgil is pretending to be Cave Johnson is sooo annoying and drags on for an unnecessary amount of time.
Also, I didn't like the design of AEGIS. It just looks so lazy, like they didn't even try to come up with an overall aesthetic design, or put any detail in it. His voice is really cool though, and you do feel very intimidated by him throughout the game.

The game has plenty of fun secrets lying around. Rattman dens, funny achievements, some situational voice lines by Virgil, door recordings from Cave and such. So definitely worth replaying to try and find those secrets.

Last thing I'll talk about is the final battle. I'll try not to spoil too much here, but I just felt like most of the challenge was overcoming the clunkyness of the damn turret you need to keep holding onto. You constantly have to drop it, pick it up, land it perfectly on the ground, fly through portals with it, all while under time pressure. And the turret's shape isn't designed for that, specially not in such a close-quarter area.
To compensate for that, the time limit is increased in Story Mode, giving you more than enough time to do the thing you need to do, which makes the whole thing pretty anticlimactic. You don't get the rush like in Advanced Mode (which was the only mode when the mod first came out).

Final rating: 7/10
It's a great mod with plenty of fun puzzles and varied settings that will keep you playing for around 7-10 hours, and though there are some issues that stand out, it's definitely a must-play for any Portal fans.

Oh yeah, and it's FREEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEE

This is a great mod that captures most of Portal 2's essence, while still having some nice and unique things for itself. The maps and levels are very nice and varied, and really has a lot of Portal 2's quality. The puzzles are fun and challenging, though there are a few that stand out from the rest for being harder. Also, throughout the sections between puzzles, and in some puzzles as well, I feel like there's a pretty big lack of direction. You'll be looking all around you for that one portal surface a lot, and can get a bit annoying. The music is pretty good. Unique and distinct from Portal 2's soundtrack, but some of the tracks can get really repetitive in those puzzles you spend more time on. The characters are okay. Cave Johnson's lines capture his character perfectly, Mel has a nice design and Virgil can get pretty funny at times. I'm not happy with Virgil's voice actor though, his foreign accent drives me nuts. And the part where you wake up and Virgil is pretending to be Cave Johnson is sooo annoying and drags on for an unnecessary amount of time. Also, I didn't like the design of AEGIS. It just looks so lazy, like they didn't even try to come up with an overall aesthetic design, or put any detail in it. His voice is really cool though, and you do feel very intimidated by him throughout the game. The game has plenty of fun secrets lying around. Rattman dens, funny achievements, some situational voice lines by Virgil, door recordings from Cave and such. So definitely worth replaying to try and find those secrets. Last thing I'll talk about is the final battle. I'll try not to spoil too much here, but I just felt like most of the challenge was overcoming the clunkyness of the damn turret you need to keep holding onto. You constantly have to drop it, pick it up, land it perfectly on the ground, fly through portals with it, all while under time pressure. And the turret's shape isn't designed for that, specially not in such a close-quarter area. To compensate for that, the time limit is increased in Story Mode, giving you more than enough time to do the thing you need to do, which makes the whole thing pretty anticlimactic. You don't get the rush like in Advanced Mode (which was the only mode when the mod first came out). Final rating: 7/10 It's a great mod with plenty of fun puzzles and varied settings that will keep you playing for around 7-10 hours, and though there are some issues that stand out, it's definitely a must-play for any Portal fans. Oh yeah, and it's FREEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEE