That would be rather random. xD Wouldn't make sense to suddenly have a choice pop up at the very end, offering a Digimon that was never mentioned and seen before. So it would create issues. Not to say that Impmon isn't fuckable, because he is. =3
I got enough game ideas and don't think I will go for an Impmon game. Not to say, you or others can't do it. After this game is complete, with art an all, I will publish the source code, so everyone can use it as a template for whatever shenanigans that are desired. Replacing Gomamon with another Digimon included. Though the code might be a bit messy as I am an amateur, so can't say for sure how helpfull it would be. ^^