I’ve likened Godot to Hypercard before– they aren’t directly comparable, but my experience using Godot brought back a sense of possibility and fun that I felt when using Hypercard back in the 90’s.
I should probably be pretty excited to learn about Decker, which has modern touches, but also seems to lean pretty hard on nostalgia and Hypercard/Macpaint aesthetics. I’ll carve out some more time to kick it around some more, but honestly it leaves me a bit cold.
One thing I looked for, and couldn’t find, was some equivalent of “background” or template cards, which seem pretty core to some Hypercard uses, like address books or proto-Filemaker databases. OTOH, maybe you can accomplish that sort of thing with contraptions, which seem like a nice way to build widgets-of-widgets.