[tyingq]

There's an overview page that does a pretty good job of explaining why. https://marcobambini.github.io/gravity/#/README

[throwaway_pdp09]

I read it, it says what it is and what it has but doesn't compare itself there to other langs.

[tyingq]

Embeddable in C and able to work on iOS and Android would cut the list of comparisons down quite a bit.

TCL would be somewhat comparable, various embeddable JS interpreters, lua, etc.

"The compiler and virtual machine combined, add less than 200KB to the executable on a 64 bit system." would make lua perhaps the most obvious alternative. Perhaps they really wanted traditional class based OO.

One of the tutorials for Creo is a good example of what they wanted it for: https://docs.creolabs.com/tutorials/game_tutorial_part1.html