they also call it a medium! i don't know why people don't talk about engines as much as games, and maybe they do but without it materializing in the same way?
Viewing post in in praise of weird game engines comments
there’s definitely stuff out there on this topic! (tho yeah probably not as plentiful as game design material)
I think this project by pippin barr is really cool: https://pippinbarr.com/the-nothings-suite/
and I often return to this excellent talk by em reed: https://emreed.net/GameArtEngines_Transcript.html