By far, my favorite spirit: 
Had a glitch a few times over with the spirit hanging out on the desk. The character would appear to pick it up, the spirit would disappear. The character would apparently flush something down the toilet, but then the spirit would again be sitting on the desk. Third or fourth time it finally worked.
I think there's something you could do with the glasses so that they have to come off. Didn't seem like there was really a reason to toggle.
By the last spirit it was getting a little old - like it was time to speed up or make things a little more complicated.
It's a great game to make in 10 days.
I really like the hand drawn figures.