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Right at the very top of the article:

> Let me tell you the story so far; the process, obstacles, and solutions involved in making a roguelike dungeon crawler playable on systems like the Commodore 64, Commodore PET, and even more constrained machines.

Javascript is not running on a Commodore 64 with decent performance.

These are machines where having 64 KB was already great, many had 16 or 8 KB!

DOjS [0] and friends often have memory requirements that outstrip what these platforms even can have.

[0] https://github.com/SuperIlu/DOjS

You write 16kb demos daily in JS/TS right?

https://pastebin.com/aBJ7eWQ1

8K (7K) Roguelike (ignore 800mb browser)

Lovely. However the poster of the original article would have trouble getting it to even parse on a C64?

Maybe to target retro computers and systems?