Cool game ! I liked the whole ambiance of it.
I liked the concept of swithching constantly between characters to unlock doors and platforms for others.
The controls felt a bit rigid and I wished I could jump with up instead of space.
Same for the dialogues It would be better if I didn't need to use the mouse (since the mouse is used nowhere else in the game) but that's just nitpicking at this point.
I'm not sure If there was an end to the game since I got Bethany stuck in a moving platform (Dammit Bethany ! ) and wasn't able to feed her to the spider...
All in all it a pretty cool game. good job :)