Yet another FPS controller simple script

FpsControl.cs

using UnityEngine;

using UnityEngine.InputSystem;

public class KappaFps : MonoBehaviour
{
	/// <summary>
	/// buffer for delta positioning
	/// </summary>
	Vector2 frame_mouse_position;

	/// <summary>
	/// ref pivot for ZQSD movement in space
	/// body pivot, will rotate horizontally
	/// </summary>
	public Transform body => transform;

	/// <summary>
	/// head pivot, will rotate vertically
	/// </summary>
	public Transform head;

	public float move_speed = 1f;
	public float h_speed = 360f;
	public float v_speed = 180f;

	public float viewAngle = 60f;

	Keyboard Keyb => Keyboard.current;

	void Update()
	{
		if(Cursor.lockState == CursorLockMode.Locked)
		{
			update_movement();
			update_looking();
		}

		if (Cursor.lockState != CursorLockMode.Locked && Mouse.current.leftButton.wasPressedThisFrame) Cursor.lockState = CursorLockMode.Locked;
		else if (Cursor.lockState == CursorLockMode.Locked && Keyb.escapeKey.wasReleasedThisFrame) Cursor.lockState = CursorLockMode.None;
	}

	void update_looking()
	{
		Vector2 mouse = new Vector2(Input.GetAxis("Mouse X"), Input.GetAxis("Mouse Y"));
		Vector2 delta = mouse - frame_mouse_position;

		if (delta.sqrMagnitude != 0f)
		{

			if (delta.x != 0f)
			{
				body.Rotate(Vector3.up, delta.x * h_speed * Time.deltaTime);
			}

			if (delta.y != 0f)
			{

				head.Rotate(Vector3.right, -delta.y * v_speed * Time.deltaTime);

				//Debug.Log(v.localEulerAngles);

				Vector3 local = head.localEulerAngles;
				if (local.x > viewAngle && local.x < 180f)
				{
					local.y = local.z = 0f;
					local.x = viewAngle;
				}
				if (local.x > 180f && local.x < 360f - viewAngle)
				{
					local.y = local.z = 0f;
					local.x = 360f - viewAngle;
				}
				head.localEulerAngles = local;
			}

		}
	}

	void update_movement()
	{
		Vector3 dir = Vector3.zero;

		if (Keyb.qKey.isPressed || Keyb.aKey.isPressed) // left
		{
			dir.x = -1f;
		}
		else if (Keyb.dKey.isPressed) // right
		{
			dir.x = 1f;
		}

		if (Keyb.zKey.isPressed || Keyb.wKey.isPressed) // forward
		{
			dir.z = 1f;
		}
		else if (Keyb.sKey.isPressed) // backward
		{
			dir.z = -1f;
		}

		body.Translate(dir * move_speed * Time.deltaTime, Space.Self);
	}
}