Hey there, I'm the guy that wrote this — I just wanted to point out that the really neat thing about this (in my opinion) is that you can gather around a single screen (located at "/canvas"), and control the bugs from phones/tablets (using "/control"). This is a much easier interface for three-year-olds to use than a mouse, and adds some interactivity that kids will hopefully enjoy.
I made this for my own three year old, and so far he seems fairly underwhelmed, but we'll see where it goes.