godot

Put move_and_slide() in _physics_process, not _process, because it reads the physics step's delta internally. Also remove any delta multiplication from velocity: CharacterBody2D.velocity is already in units per second, so multiplying by delta makes speed scale with frame rate.

Writing to res:// in an exported build is not blocked and reports no error, but later reads still return the packed bytes, so the write is a silent no-op. Use user://, the only writable location in exports; the same code works in the editor, which is why the defect survives testing.

The := operator on a Variant-typed expression is a parse error, not a warning, because inference_on_variant ships at Error level. Declarations like var x := dict["k"] or var x := untyped_call() stop the script from loading; declare the type explicitly instead.

Web supports only the Compatibility renderer, which is why rendering_method.web defaults to gl_compatibility. Volumetric fog, SSR, SDFGI, VoxelGI, TAA, and FSR2 are Forward+ only and silently absent on web; read the active renderer at runtime via RenderingServer.get_current_rendering_method().

godot --headless --quit-after N exits with status 0 even when the main scene's script fails to parse, and N counts frames, not seconds. Gate on --check-only and grep the output for SCRIPT ERROR or ERROR lines instead of trusting the exit code.

No. Unity and Unreal are separate skills and nothing here transfers; Godot 3.x is covered only as a source of migration traps. C# language and .NET tooling belong to the csharp-dotnet skill, though Godot-specific C# binding differences are included.