Yeah, I think Illgames is just a rebranded Illusion. They had some internal disagreement over stupid things so some devs moved and started Illgames. But everything is pretty much same low efforth garbage, that use assets from previous games.
To be honest, when people play an Illusion game for the very first time they will have fun. But after playing 1 game you will realise it is all the same.
But I guess I have to give them some credit for creation of Honey Select 2. Some AVN developers use that game to render images for their own games, lol.