Originally Posted by LuigiHann
there's really no fundamental reason why it couldn't or shouldn't be voiced.
a) they want to retain the feel of the comic and shorts by using only word balloons
b) they wanted to invest less money because it's a pilot and voice actors cost more than no voice actors
c) since there are lots of mini-puzzles, there will be much more characters than your regular episode cast, requiring more different voices that get less lines each, which isn't as practical to voice
These all sound like plausible reasons to me.