ty for the answer!
curiosity/idea: if it’s html/js/css, aren’t there wrappers to make it playable outside of browsers?
yup! the game is made using twine so i think it would be possible to turn into an electron app or something like that. but honestly i'm moving away from twine and planning on making my games on a proper game engine (godot, most likely) so porting the hanging heart is a good opportunity to learn godot & to make it downloadable.