Tldr:
The game is a disappointment, it tease, it goes around, senselessly grinding , achieving nothing, for something that as been dragged on for so long, there's a surprisingly thin amount of content, as we're basically at the same spot we were, 3 years ago, when we first landed on that rooftop.
Preface:
I've been supporting this game since it's first iteration, as it was a promising and original idea, and even though the DEV grew with experience, resources and partnership, the production value of the game went downhill, shorter patch, endless reworks, removed content... I thought it was about time I gave my opinion and leave this to rest.
Art:
Visually It's OK, if you look at Genno's work (in general), you'll realise that he's a "one trick pony", all of his characters look the same, the drawing is typical of someone that's self taught, with horrible anatomy and inconsistencies, it's all saved by outstanding colouring skills.
Another component of the inconsistencies is the recurrent (and unsolicited) rework of the game's illustrations, making Cath look like two completely different peoples from one scene to another, all the while saying that "there's just so much new art that can be added to the game because it's expensive and take a lot of time to make".
Sound wise, the choices of music are ON POINT, it's catchy, even for copyright-free music, showing the DEV's great taste and is cohesive with the game as a whole. ...The VOICE ACTING is a complete miss for me though, Catherine sound like a chain smoker, with her low and raspy voice, and that really doesn't do it for me, fortunately there's an option to mute the sound, so, no problem there.
Writing:
Either the DEV is a very cultured individual or he's smart enough to make a ton of clever references, all the characters are well though out and distinct, the dialogues are great and the plot was well put together... until recently, as unfortunately, dragging on a game instead of giving it closure is far more lucrative. so instead of having the SEWER quest line and Catherine's initial objective to escape the rooftop, we're left with loose end and plot holes, as now it's (the sewer) becoming an extension to the bar, and all the other girls join to bar-tend instead of being designated antagonist (as they should have stayed).
Fetish:
Silly you would think (for reasons) that the game offer depiction of corruption, bondage, group sex, exhibitionism ? you would be wrong, as time passed, the MAIN focus of the game revealed itself to be... cum play, even if it doesn't bother me one bit, there's a VERY strong emphasis on that, and solely that, sadly, if you were expecting anything else (as the game doesn't advertise itself as such) you will be in for a disappointment.
As for the (attempt at) corruption, it fallow this same weirdly (and uncharacteristic) stupid notion that sexual acts goes gradually from handjob and blowjob, to sex (vaginal penetration) as it would be the pinnacle of corruption... if it didn't sound idiotic enough, it's exacerbated by how it play out, since low corruption is just being a exhibitionist eye-candy, shoving a bottle in her vagina in public and sucking dicks at the local glory-hole... while consensual lovey sex in a bed is accessible only for the most depraved.
it's completely backward.
Gameplay:
It's a bar-tending sim, You play as Catherine, assisted by her lover/provider/tormentor IO the artificial intelligence, You have a routine, wake up, tend the bar, tease the customers, check the stock and supplies of booze, and scout the rooftop in order to find a way to escape.
that was the original plan, at least... since the DEV decided to remove the "brewing" and planning aspect, you're left with "customer want beer, clic beer, task finished"... there are (of course) pleasant visuals to compensate for the most boring gameplay loop, and instead of having what would have been a fun, intriguing rpg adventure, all you get is always more of the same.
Conclusion:
The DEV built himself an echo-chamber, and grew complacent, that's really the gist of it, Succum Brewery started as a great narrative with spicy elements, but as the story was ditched, it now stand awkwardly midway between porn and game, failing at both.