Ok, i know i'll get lot of "ugly comments" for what i'm going to say.
ICC may re-use too much the characters of old games, that his MC is always the same with the same idiotic face, and that there are clear similarities between his games, but somehow, he always manage to get a decent story out of it, not unlike the same old, in games, MC/FC has no background is gifted with some power and have to save the world, the princess, the kingdom..... And he does finish what he start.
Only two of the MCs really look the same: the one from
F.I.L.F. and this game. The one from
F.I.L.F. 2 sort of does, but not all that much. The MCs from
The Artifact series don't look like the one from
Incest Story, nor like his latest games. So visually, most of the time there's not really much similarity directly. Facial expressions tend to be relatively samey, but this would hardly be the first developer where that happens, Mr. Dots immediately coming to mind.
Now that you mention it, I don't see any similarities at all...
The plots definitely have more similarities.
Altered Destiny is clearly a fairly modified version of
The Artifact, with the initial premise being extremely similar. And
Incest Story and
F.I.L.F. have the same overarching story as well. TBH, while I do have fun playing ICC's games, I will admit that I play them maybe 15–20% for the game's overarching story and much more for the enjoyment of his renders and the individual characters' personalities and stories (except where they sometimes mirror each other).