Well, yeah? Generating is impossible here (well it is possible, but levels won't be interesting). Creating level editor + level format can also take much longer that just writing them by hand.
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You should take a look at my crate https://crates.io/crates/bevy-yoleck. It takes care of the level format (you just need to provide types with Serde's derives) and provides utilities for easily(ish) adding the editing capabilities.
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