Our scriptwriter is a bit insane, indeed, but he enjoys his work 
. The problem with voice acting is that there’s a very large amount of dialog to be acted (some of which the player might not even access before a number of playthroughs) and we’d also need a lot of different voices to cover the changing cast of characters we have planned for each episode (level). All of this dialogue needs to be acted by somebody that knows what he’s doing and then mastered by our sound guy. We simply don’t have the resources to hire that many voice actors for that amount of content.
What we can do (and what we’re actually doing this week) is call on a bunch of friends to act out the gesture animations for the characters. We then take the pictures and our artist draws over each frame. Since they just have to act out some passive gestures, they don’t need to have professional acting experience, hence we don’t go bankrupt.