Hey folks!
This is technically slightly outside the remit of this list, but I felt it proper to give credit where it's due.
minicosm is an FP-oriented game engine for the browser that was significantly inspired by the approach in Racket's universe.
The idea here was to have a similar concept of a system of functions happening on a game state, with user API being purely functions that take data and return data, with all mutable behavior handled by the game loop runtime. It goes in a bit different direction, especially with the picture language, but it may be of interest.
I'll be hopefully given a talk later this year (barring ongoing events), and possibly a game jam in the coming months.
Have a good one,
A.C. Danvers