This is a fun project. Even without seeing the original script next to it, it's fun to try to reverse engineer what each text box is meant to mean. Surprisingly enough considering how supposedly sophisticated the machine translation is, a lot of these are the types of basic mistakes that you would expect from a beginner or a really bad computer translation.

I suspect they translated each text box separately, instead of joining multiple text boxes into one string - because I frequently get much better translations than this from deepl. Japanese is a language that is often difficult to understand without context, so the smaller the chunks of texts are the worse a computer will do.

Stuff like: "Your brother is probably a man. Probably an adult." is just a bad translation of でしょう.

"Put the bomb in the ring in his hand" The second part is an overly literal translation of 手に入る, and the ring was probably called 爆弾の指輪 or something

”Very!" is probably just 全く

etc

These are things any intermediate learner would know, and yet AI models still struggle with them.