I learned Rust (and frankly, most of programming) with Bevy :) It was a good experience, although I definitely recommend learning the basics from the Rust Book as you go to reduce frustration and confusion.

In simple game code you don't need to write your own traits, use unsafe, and like laundmo says, the borrow checker pains are way easier than in most Rust codebases because there's already a nice architecture in place.