Was this Claude Code? If you tried it with one file at a time in the chat UI I think you would get a straight-line port, no?

Edit: It could be because Rust works a little differently from other languages, a 1:1 port is not always possible or idiomatic. I haven't done much with Rust but whenever I try porting something to Rust with LLMs, it imports like 20 cargo crates first (even when there were no dependencies in the original language).

Also Rust for gamedev was a painful experience for me, because rust hates globals (and has nanny totalitarianism so there's no way to tell it "actually I am an adult, let me do the thing"), so you have to do weird workarounds for it. GPT started telling me some insane things like, oh it's simple you just need this rube goldberg of macro crates. I thought it was tripping balls until I joined a Rust discord and got the same advice. I just switched back to TS and redid the whole thing on the last day of the jam.