The dialogue is a lot of fun. But the "Are you having fun/We are watching you" person did not pay me! Gimme my money >:(
I think the "slow" feeling of the game was in part that the characters walk slowly to and from the booth, so it takes awhile to get the next question, and partly because you can't tell how many questions there are in total. Some games have a feature where you can speed up the game pace by pressing a button (while holding space characters walk 2x faster, for example). Personally, I don't think this game needs a feature like that because the walk speed adds to the atmosphere.
I do think it might be good to have more of an indication of how many questions are left. There are a lot of them, and I almost stopped playing because I didn't know how much longer I would be answering questions.
There is actually 50 questions in the game. and the people that don't pay you are on purpose. I think there might be another ending seeing how ominous those questions are. I know there is at least one more ending, but I don't want to spoil it for you.