I played your game last night and got...maybe 5 of the endings. I kept playing until I was certain that I played all that I could before I commenting.
Is it worth going through the extra effort (beyond NaNoRenO) to make CGs and sound effects?
I think it's always worth the effort to make the CGs, unless you want to keep the vague descriptions of some scenes, like Tara and Jason kissing as it is, when an image can help a whole lot more. But this depends totally on what
you feel like doing, how much more extra work you want to put in the game, and how tired you are after just completing it. Do whatever works best for you.
I think that the game can benefit greatly with the right sound effects though and they can help enhance certain scenes in the story.
- Were there too many characters? Who could I get rid of? Who did you want to see more of?
Hmmm...I don't think that there was to many characters. Even Tara's mom and sister were relevant for when she went to stay at her mom's house, and the friends helped guide her path towards Jason's, so its fine with me. I think Micah's path could have been expanded or deleted, because he feels like an add-on instead of a part of the story. I think it would have been an interesting angle to see how he would have helped solved the story. Though I wouldn't have wanted him to die.

Oh yeah, and I would have liked to see more of him
- Was the plot too jumpy?
I think it might have been. Like right when we thought we destroyed the being the second time, he came back again just for one last round. I was ready for the ending right then so I was sort of mad that he came back again.
And that he took over Jason >__< I'm glad it's dead
- On a scale of 1 to 10, how predictable was it?
It
was predictable at some points. Can't say that I can rate it since the game did surprise me here and there, but some things were just to obvious.
Like when George just happened to come into the building somehow not noticing the police cars or running across any dead bodies. It was obvious that he was going to be the one
- which character had the best sprite? (or the worse)
I wasn't really looking at the sprites to closely to compare.

Sorry. I
can tell you that those two downward pointed fingers of Lilian's scared me, Peter had a hunch back(which was fine if that was intended) and I thought Joanna and Tara in her winter outfit was well made.
- which is the best background
Err..........................................................( I really wasn't looking that hard. >__<) Checks again. The shared boardroom was decent, Tara's bedroom was alright, but I think the attic was the best so far. Now that I think about it, you had a lot of backgrounds that were included in this story and that must have been a lot of work. I liked the feel of the office. It was soothing.
You had a lot to do to get this game ready for NaNoRenO month and I'm glad you finished it. Cutting 50, 000 words down to 20,000 could not have been easy.
I loved the main menu music, but the transparent menu was clashing with the background of the main menu. The font you used had a weird 'g' and 'f' that threw me off and was sometimes hard to read. I couldn't understand what the typo and plot menu button was for, do they even work?
I liked the way you introduced new characters by having them slide in the screen. It was only later that I noticed you did this for only the two creative men. Was this a clue? I liked that you made the ghost zoom in on the screen until it was almost upon us. It was a nice effect. I was surprised at the particle effects, but I liked them. Though the leaves you used at some point felt odd to use at other points.
I'm glad the thing finally died, I'm not really good at scary stories, but I feel that a lot of questions about the creature wasn't answered. Why did it not like creative women? That didn't make any sense. Out of all the women to dislike he disliked the creative types. Why creativity? What was the big deal about it? Why did it drive him to kill. I think the story was still missing a good reason for that.
I'm sad Joanne kept dying no matter what I tried to do. I do wonder why a woman who was a professional with ghosts would choose to go off alone without any protection. It makes no sense. I also wonder why Harmony didn't seem to comment about her death that much either. Is it a cat thing? And one more question: What happened to the dog?

Overall, I liked the game

I liked the style, the sprites, and the colors. I hope you decide to add some sound effects and maybe some more of Micah. Waiting patiently for the complete version.