Hey, you asked me to through your game, so here I am.
The puzzles are really cool. I liked the octopus puzzle, for instance. I had to stop at the eyeball puzzle, though, since I couldn't figure that one out for the life of me.
I think for stuff like that it would be really awesome to have people playtest more to tell you which puzzles are perhaps too hard. You mentioned that nobody has gotten all 5 endings yet. That's pretty cool, however that also tells me that some of the puzzles are difficult enough so that nobody has solved them in the time they have, which isn't quite ideal for most puzzle games.
The puzzles I was able to solve were pretty fun, though. I liked that part of the game.
One other thing- the music was pretty basic, but it worked with the lonely dark environment you seemed to be going for. That was pretty cool.
Overall, nice job! I think that the game was good overall except for one or two puzzles which were pretty tough.