> I always feel like I'm making wrong decisions on if something should be a component or a field... I just feel like I'm making an unmaintainable mess,

That is true for all game platforms, experience takes care of it, don't give up.

About compilation time concerns, it doesn't seem to be a problem with Bevy, there's a fast compile mode with very reasonable performance.

However, I didn't see any scripting, there are scripting options for rust, it would be good to have bindings for some rust-like scripting.