Shader compiler error when building for OpenGLES30

MyShader.shader

Shader "Sprites/ShaderBugTest"
{
	Properties
	{
		_ValueB ("A", Range(0, 1)) = 0
        _ValueA ("B", Range(0, 1)) = 1
	}

	SubShader
	{
		Cull Off
		Lighting Off
		ZWrite Off
		Blend One OneMinusSrcAlpha

		Pass
		{
		CGPROGRAM
			#pragma vertex SpriteVert
			#pragma fragment SpriteFragHSV
			#pragma target 2.0
			#include "UnitySprites.cginc"
			
            half _ValueB;
            half _ValueA;

			fixed4 SpriteFragHSV(v2f IN) : SV_Target
			{
				half stepB = step(_ValueB, 1);
				half stepA = step(1, _ValueA);
				
			    return stepA * stepB;
			}
		ENDCG
		}
	}
	CustomEditor "HueShiftMaterialInspector"
}