Just finished the whole game. I did the slave routes (because I figured it was the highest likelihood of getting MC content).
For a free porn game it's an ambitious and high quality effort. Given how many games get abandoned, it being complete is also impressive considering it's scale - four chapters, each with a fairly lengthy story, lots of content, and unique game mechanics. Going back to old posts in this thread I see that it took a long time to get there, but still, kudos for seeing it through.
I'll get negatives out of the way to start with. Firstly, some of the ageing up strained credulity. The game poked fun at this itself, but honestly I would have preferred being able to skip some characters entirely based on personal preference - and it was unfortunately woven tightly in some areas and unavoidable unless you wanted to skip an entire 1/4 of the game (i.e. Toph being the core of the Earth chapter).
Secondly, I think that there was a recurring issue in the first three chapters where it was easy to be unclear on how to progress past certain points, and there was a reliance on the assumption that you'd just go everywhere and talk to everyone to proceed. Or return to places where there was nothing, and find something there this time. Or repeat the same type of sex scene with a character several times to progress. The 4th chapter introduced a hint system that mostly resolved this as a roadblock, although by then you've generally figured out the expectations the game has on this front.
That's mostly it for critiques.
I think that as the chapters went on, the game became more refined in general, so the first impression the game gave me in the Water chapter was a lot rougher than the average quality of the game overall. Obviously in an ideal world of infinite resources there would be a second pass at the earlier content, but that's asking a bit much for a community effort!
In terms of the games strengths, firstly, the art style is very faithful to the source material. Great work there. It captured the look of the shows and characters very well. A lot of games out there either use real photographs or use CGI renders. Few produce high quality 2D art with a consistent and coherent art style, especially in such high volume. Granted, some of the minigame art was less refined, but overall it's very good.
Next, the writing, although deliberately silly and not taking itself seriously, still managed to come off very well. There's fourth wall breaking, but it managed to avoid feeling too annoying like it does in some cases. It doesn't have the feeling of being written by a wierdo shut in blob person who hates the world, but instead by actual humans. The game's writing captured some poignancy in moments, and just as the game became more accomplished in design and technical matters as the chapters went along, the protagonist felt like he matured a little bit. Perhaps this is a little bit of the game's production bleeding into the story - both were long journeys that eventually had to come to an end.
Despite the above issue with Toph, my overall favourite chapter was still Earth. Partially, this was because my primary fetish is Mind Control, and that chapter was a treasure trove of content for that. Three characters to train with the Dai Li brainwashing, one you got to hypnotize a couple of times, and one you could find the triggers for - a surprisingly meaty amount of content for a game where this was not the primary "point". Of course, I'm greedy, so I would have wished for a little bit of that stuff to return in chapter 4, but still, what's there is good. Aside from that, I also think the Earth chapter was the one that was the easiest to understand and navigate. It had the least moments where I got stuck or confused. I do think it was designed pretty well overall, a kind of base building mechanic was a nice way to sink resources, and I was impressed that they built a pseudo pokemon minigame. It wasn't the best thing ever but it was a lot of effort!
So overall, again, very good and an impressive finished product. Thanks to the creators for making it.
Now I've done many, many FET rounds and - let me tell you, I always choose love route 
