Very Cool Animation! This is likely done with a free program called PIVOT which you can download and play with too. Watch this first without the sound. Then let your kids narrate it as you watch. Finally turn on the sound. I really don’t think the sound adds that much. Soundless it’s like watching a moving comic book.
If you or your kids create a Pivot animation, let me know. I’ll figure out some way to post it here for all to enjoy!