I've been playing this game on and off for almost the game's entire lifespan. It's kinda a mixed bag, but overall good IMO. I once heard someone describe it as "the Cronenburg monster of furry games" and I think it fits pretty well. I would consider this a game with a heavy emphasis on TF in all it's forms (full of furry TF, plenty of TG, and I think even a little object TF and odd ball stuff). It's all over the place in terms of TF themes, with historical stuff, sci-fi, fantasy, mythology and general furry. It has less emphasis on slower, more precise, character customization style TF than the other two most notable text based furry TF games (Lilith's Throne and Fenoxo's offerings), and more focus on chaos and the changing itself. If you do prefer to change on your own terms, there's a scenario for that, and you can even microwave yourself to get some change resistance.
Gameplay wise it's something like That TTRPG 3rd Edition with your ability checks and d20s, 6 ability scores (perception instead of wisdom), perks every few levels, etc. Smut wise it's a blend of "smut on defeat/bad end", "smut on victory (if your character is horny)", and completing goals and questlines. All in all it's pretty fun as a game even without the lewd stuff. Build variety is pretty cool, with ways to make just about anything viable.
Another thing it has going for it is the sheer mountain of content it has from over a decade of fairly consistent updates. This content covers all kinds of fetishes, including those that usually only show up in weird furry territory. Object TF, feral, mind control, lactation, unbirthing, latex, dom/sub play, vore, mpreg, abominations, pregnancy/breeding and more are all on the table, but don't let that discourage you as they've implemented a tag banning system, plus many are niche and can be hard to find anyway. What you will almost certainly find a lot of is TF and TG (TF through sex and infectious fluids), corruption/mental TF, dubcon, and stuff for all orientations. You might think this content falls under the classic "wide as an ocean, deep as a puddle," and to an extent, you'd be right. The bulk of the creatures/TFs and some quests are mostly standalone, and early on the original creator seemed to be taking any submissions into the game. On the other hand, the devs have been pretty good about expanding some old content and also have been doing some work to interweave the horde of NPCs that are recruitable to your home base. Sadly that can only go so far and every chain comes to an end, but it isn't a tabletop.
Where the mountain of content really falls short though is documentation. The wiki is an invaluable source of information for the bulk of the quests, but even then it's often outdated, and very much missing content. There is a huge amount of info I would have had no idea existed if I hadn't been following the game's development and seen a sentence hinting at it. Believe it or not, in my experience the best wiki for the game is the source code, so long as it's still easy to find. This sounds worse than it is, as Inform 7 (the programming language it's in) is basically written out in English sentences. Of course you still need to find which file has the event or whatever you're looking for, and it's shit for finding secrets unless you're dedicated as fuck. Good luck I guess.
Also I tend to be a cheater at these kinds of games after a fashion, and there's plenty of options for that. The engine offers a handy Undo command. worth noting that that still keeps everything cached in your save, so eventually the save gets too bloated and corrupted. The devs implemented a workaround to this in the form of an NPC that offers cheats as well as an alternate save import through the "Saveword" command (think old games that gave you a save code). This can also be used to cheat though, as you can pretty easily figure out which numbers in the code are your base stats and give yourself 100 dex. Before any of this though was a cheat code you get from ending the game with a high score (much harder to get with cheats active), which I will not spoil here. That's four avenues for cheating, so plenty of options.
So yeah, mixed bag, but probably the best game you'll get for niche stuff like vore and UB, and TF for TF's sake. Also just generally weird stuff going on. Joke monsters exist, and yet somehow aren't too out of place. Some of the content is fantastic and still holds up, but most of the content isn't new to me anymore. You likely won't be able to do much better outside of ERP with a fellow degenerate. Or perhaps AI generation...