Thank you for playing! That behavior isn't intentional. They shouldn't really do anything except move a little. I'll put it on my bug tracker and see if I can figure it out, but if you have any video of it happening you could share that would be super helpful.
I finished the demo in the meantime, I loved it! Here's the video! https://streamable.com/874srw
Just to note, I downloaded the game thinking maybe it may have been an issue with playing on browser, but the same thing happened. Let me know if you need any other information!