Press space. I couldn't decide to do the characters with or without mouths, so I did them without, but if you press "1", you can see a version that I made where I actually gave the characters mouths. To go back to the version where they don't, simply hit the green flag.
Yes, this is based off of something. No, I'm not going to tell you what. (Not yet, at least.) When I originally made this I wasn't going to share it. I actually made this in the beginning of the summer (2020). Recently I looked back at it and thought, "you know what, why not? I might as well share it." So... I did.