This is perhaps the longest gay VN I've ever played. Unlike most VNs that feature multiple love interests where you get to romance only one of them, Sinsations actually require you to romance all of them, which contributes greatly to the game's length. You may have not seen all their scenes in one playthrough. And you definitely can't get all achievements without save-scumming and playing from the beginning several times
You can choose to date them in any order, but playing their routes in certain sequence unlocks unique scenes from that specific love interest in someone else's route. However, if you want to settle with one of them, then you have to romance your favorite guy last. I like it, because that's how I usually play dating games
Since the point of the game is to get the guys to love the main character Kousuke, expect many sex scenes. I dare to say Sinsations is basically what most gay guys want from a gay dating visual novel; steamy smut without too much essence in the story. But still, every love interest has their own fair share of issues and dramas to deal with, from a mundane family issue to a gunfight with drug cartels
You get to see what the love interests do in their own scenes, but they are mostly only shown in CGs and described briefly via Kousuke's narration. Except Sloth's routine; all of his scenes pertaining his work with cryptocurrency is explained in extensive detail. Not via Kousuke's narration, but actually by Sloth himself. It feels more like a marketing strategy or a business propaganda, rather than fictional story, despite Sloth's currency is fictional. This makes his route boring and feel like the longest, with the least amount of sexy time
It's also possible to end up not settling in with anyone, but it is very anticlimactic. The game just abruptly ends as Kousuke leaves the final love interest. I find it a downer since I like none of the love interests
Another thing that I don't like about this game is the artstyle. The characters are drawn rather angularly. Every joint, corner, and facial structure look very sharp, even for yaoi standards I think
Also, the devil Abaddon, has the echoing demonic voice, but his design is very underwhelming. Looks more like a generic red blob, which is a very odd decision. Usually a devil-type character has more intricate design to it, so I'm not sure what was the thought process in designing Abaddon
If you're looking for cute, hot guys and plenty of sex scenes, Sinsation is the best game to experience them. It's just that, for a game that supposedly has supernatural elements, there is little to nothing about it at all. The only reminder that the game is remotely supernatural-themed is the presence of Lucifer (and occasionally the glob-like Abaddon)