I care a lot about story in a game, so it would annoy me to see a character appear in the game who broke the fourth wall (unless fourth wall breaking was a part of the story, like in the Deadpool comics, though that would make me regard the story as a comedy, by default), so I wouldn't like to see CoffeeCurse appear in the game, sort of figuratively winking at the audience like, "That's right. I'm the creator. But I'm also a character in the game."
But it's a good character design. Also, given your propensity for bantering with the people here as if you were getting sexed up by your characters, it would be kind of fitting to see that happen in the game.
Here is my personal recommendation, since you asked for feedback. I think that it would be cool if your avatar appeared in the game as a supporting character, under some other name (Amy, Judy, whatever-you-please), and treated like just another character. This would sort of make it an easter egg for the people who are in the know, like those who have been active in this thread and your supporters. For anyone else, it's just another character in the game. But, for the people who know, it's like an Alfred Hitchcock cameo. "I spotted Coffee."
I would definitely like to see your avatar in sexual situations in the game. Obviously, since the main characters and prominent supporting characters are already set, your avatar couldn't appear in too many scenes, unless you decide to expand the roster of characters by one, which wouldn't bother me. But even if your avatar only appeared in a couple of scenes, I would want to see some sexual content.
I'm not particular about what role your avatar could play. The suggestions above of a customer in a cafe or the owner of a cafe would be fine with me. Or you could go with the suggestion I made in
this post. Personally, I think that the suggestion I made would allow for the character to appear in multiple scenes without too much impact on the main story, but any way you want to do it would be fine.
As for the specific type of content, I would like to see your avatar get dominated - really turned out and put to work as a cock sleeve, I mean. I wouldn't mind an alternate version in which your avatar got to do the cock slinging, but that would be a bonus, as far as I'm concerned. I would be most interested in seeing your avatar bottom, certainly for Laura, and possibly for someone else, such as Nicole or who-you-will.
Edit: So, yes, a full character who just has the looks of your avatar, but is a different character canonically.