Honestly, I just found this game now, and I'm saddened to hear that it's just gonna collect dust as is. A fully-3D bondage platformer is something I've wanted for the longest time, and this scratches every last itch. I do have just one teensy little complaint about the game as it stands now, though.
Holy f*ck, please never used inverted camera controls again (or at least give the option to switch between normal and inverted). I had to turn my mouse completely upside-down to play this game even somewhat normally. But on the same token, thank you for having an in-game speed controller so that the pace doesn't seem so dreadfully sluggish, especially during the hogtie parts.
Also, I got stuck on the "knife room" part as well, but I wasn't stuck, per se... the items you pick up have a slight bit of collision to them, so I used the screwdriver I carried over from the prior vent sequence or the key from the next room as a sort of stepping stool to hop up onto the smaller crate and then the larger ones. It took me about a half-hour just to make it up that first step and still be holding my item if I pressed Enter fast enough... and if you can manage to do that, you can slightly cheese the Arachnobot section by opening the grate beforehand; it kinda removed a lot of the tension, but those piercing red eyes will still haunt me. On the other hand, getting caught in the latex baths was fun to watch; alternate costumes for Normalin like a "rubber-slut" variant would be fun to watch bounce around for a bit.
TL;DR: I wish you hadn't stopped developing this. It has a lot of creative mechanics, and turning it into a Metroidvania of sorts by limiting the player's movement and abilities through bondage is by far the most novel concept in a game.