Hmm, could use click-skippable dialog, maybe even a skip to the decision after the first play, and could use more choices (with the logic behind them) and endings, such as:
1. Shoot one of the dead bodies. ("It was definitely that person")
2. Shoot ALL of the dead bodies. ("Well that was easy to figure out.") (The choice I wish I had.)
3. Shoot Aleph. ("It was you all along! You almost got me!")
4. Shoot yourself. ("I could be the killer!")
5. Shoot Aleph than yourself. ("It's better to die on our terms!")
6. Shoot all the dead bodies, then shoot Aleph (or vice-versa). ("I can't trust anybody!")
7. Same as #6, also with shooting yourself. ("I have to be sure!")
8. Shoot everybody else in the leg, starting with the dead bodies ("I've caught you now!").
9. Don't shoot anybody. ("What if Proxy is lying? That nobody is possessed, and that s/he/it can kill without a body!?")
10. Same as #9, but it was all a prank (on Aleph, or the player)! ("April Fools!" Or "Happy Halloween!") (Given that it's October, the latter would be quite appropriate!)
11. Maybe a combination of any of the above.
12. After the first (correct, in your eyes) play-through, maybe have an options menu where you always make the correct choice, just for fun, maybe even throw in some dark humor.
13. The opposite of #12.
Getting back at the game, the advice I can give all of you is not to rush, you are a detective after all, take in EVERYTHING.
As it is right now, it takes too long just to get to the part where you actually make a choice and therefore "play" this game, hence the replayability will suffer, along with the people who are waiting it out, hence the low score I give it.
The potential is there, though. Make an update or remaster or even a sequel with all this in mind, and I'm sure people would like it even more.