I'm not old enough to have known Hypercard, though my thesis very adjacently touches on it (kind of, not really, but it talks about Douglas Engelbart and Ted Nelson and hyperlinked text and how it devolved -- according to Nelson -- to the www).

So it's really cool to see hyper card for real this time!

Oh! Of course! I presume you can also inject JS into Google Slides itself. Hmm... I'll see if I can make a simple game then, when I'm bored again.