I discovered four different endings, divided into two routes.
The first is to confront Hudson alone. The alternative is to go after the police.
The second is to go to Leija and let her handle everything. The alternative is to deal with the reinforcements (IBWO).
Note that in Leija's route, and only in Leija's route, you can achieve the final physical transformation. What I find unfortunate is that the transformation is accepted by everyone as if it were nothing. That's the only problem; it happens too quickly, and you don't get to enjoy the transformation since the path to the ending unfolds automatically because you can't leave your house except through it.
Note that you can still see some scenes using the computer and the dildos, and look at yourself in the mirror.
Apart from that, they are good endings, quite long and which take into account our actions throughout the game.