This looks amazing. The best one I found. It's still in development? The repo works fine but this particular demo looks like it's made on godot 3?
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The demo is 3.x but the repo is updated to 4.2+. The project hasn't been in active development for the past 6 months but it's not completely abandoned, I just haven't been able to focus on it. However, the state management and hitbox organization tools are pretty stable. Though if I recall correctly there was a major bug with the input system, but it should be mostly functional.