My attempt at camera shake - didn't work.

CameraController.cs

using System.Collections;
using System.Collections.Generic;
using UnityEngine;

public class CameraController : MonoBehaviour {
	[SerializeField]
	GameObject target;
	[SerializeField]
	float lerpSpeed = 2f;

	//shake
	[SerializeField]
	int seed = 210795;

	[SerializeField]
	float maxOffsetX = 1f;
	[SerializeField]
	float maxOffsetY = 1f;
	[SerializeField]
	float maxAngle = 10f;

	float trauma = 0f;

	//internals
	Vector3 purePosition;

	void Start() {
		purePosition = transform.position;
	}

	void Update() {
		//test
		if (GamePad.GetState().Pressed(CButton.A)) {
			AddTrauma(0.5f);
		}

		//only continue if the target has been set
		if (target == null) {
			return;
		}

		//cache the position we want to move to
		Vector3 targetPosition = target.transform.position;

		//Interpolate to the target location
		purePosition = Vector3.Lerp(purePosition, targetPosition, lerpSpeed * Time.deltaTime);

		//Snap to pixel coordinates
		Vector3 shaken = Shake(purePosition);

		shaken.x = Mathf.Round(shaken.x * 100) / 100;
		shaken.y = Mathf.Round(shaken.y * 100) / 100;

		shaken.z = transform.position.z; //BUGFIX

		transform.position = shaken;

		trauma = Mathf.Clamp(trauma - 0.005f, 0, 1);
	}

	void AddTrauma(float amount) {
		trauma = Mathf.Clamp(trauma + amount, 0, 1);
	}

	Vector3 Shake(Vector3 position) {
		float shake = trauma * trauma;
Debug.Log(shake);
		position.x += maxOffsetX * shake * (Mathf.PerlinNoise(seed * 1, Time.time) - 0.5f);
		position.y += maxOffsetY * shake * (Mathf.PerlinNoise(seed * 2, Time.time) - 0.5f);
		transform.rotation = Quaternion.AngleAxis(maxAngle * shake * (Mathf.PerlinNoise(seed * 3, Time.time) - 0.5f), Vector3.forward);

		Debug.Log(position);

		return position;
	}
}