It's basically porn. Haha.
Now look, I do enjoy an occasional porn with no plot. However, this feels more like smut with a haphazard plot. There's not really any tension and the characters are shallow. I'm basically echoing what Pink has said, so I won't lay on this too thick.
It's obvious that the most effort went into the presentation, and I commend that. The animations are simple but effective. That being said, the four wolves look and act very similar. There's not really much to distinguish them aside from fur color, size, and occasional personalized facial expressions. The sex is hot, though, and I love a good internal shot (even if the same one was just used four times).
My biggest issue, however, is the fact that this doesn't have any functionality of any other visual novel. There's no saving or skipping or even pausing. The game forced fullscreen for me too without any way to switch to my preferred window mode. The reader is essentially forced to read the whole thing in one sitting, and the only way to get out is to Alt-F4 the application. Now, I'm not going to sit here and dictate what engine people should use, but this major hurdle could easily be avoided if this was made in Ren'Py. Thankfully it is a short game, but if it was longer? Oh boy.
I know the author was simply going for "hot men, hot sex", and that's exactly what we get. I did find it arousing, haha. But the barebones functionality really brings it down.