Tried launching this through the Itch launcher. Getting an error for missing features: "Cross-Origin Isolation" and "SharedArrayBuffer"
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Ah, if the itch launcher doesn't support SharedArrayBuffer (and I assume Cross-Origin Isolation too, not sure what that is though), then yeah it won't work there unfortunately, does it work for you if you just open it in browser? (ideally chrome/chromium based since godot itch.io games gave a lot of issues with firefox)