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I also did that year in haskell! My favorite part was using knot tying to feed the output of my intcode machine into itself! Lazy evaluation allowed me to continue expressing my intcode machine as a pure function of [Int] -> [Int] without having to restructure the entire machine to allow getting an output, then adding the next input to the machine in a step-wise manner usually accomplished with generators of some sort in other languages

my fun thing was running my intcode computers in parallel

Was this 2019? I did half of it in elm. Simulating a processor with the core states of read, eval, and write was very cool. Using setTimeout to send it clock signals was very slow until I realized I could compose the processor step function to run a few thousand clock cycles per timeout. Wild time.