Bat sine movement 2d Game help

Hi - So I wrote this movement script in one of our jams. It's object-oriented so you could easily create and plug-in other types of movements like Linear, Circular, etc.

Here's the base movement class, from which you could inherit, override GetY to get your custom movement behaviours:

 using UnityEngine;
 
 public abstract class BaseMovement : MonoBehaviour
 {
     public float minSpeed = 20f;
     public float maxSpeed = 100f;
     public float minInitialOrientation;
     public float maxInitialOrientation;
 
     protected float speed;
     protected Vector3 velocity;
     protected Vector3 direction;
     protected Transform mTransform;
     protected Transform cachedTransform { get { if (!mTransform) mTransform = transform; return mTransform; } }
     
     protected virtual void Move()
     {
         velocity.y = GetY();
         cachedTransform.localPosition += (velocity + direction) * Time.deltaTime * speed;
         ReactToEdges();
     }
     
     protected virtual void ReactToEdges()
     {
         Vector3 viewPos = Camera.main.WorldToViewportPoint(cachedTransform.position);

         // Ping pong between the edges of the screen. If we touched an edge, we reverse the movement direction
         if (viewPos.x <= 0 || viewPos.x >= 1) // left/right edges, reverse the x coord for the direction vector
             direction.x = -direction.x;
             
         if (viewPos.y <= 0 || viewPos.y >= 1) // bottom/upper edges, reverse the y coord of the direction vector
             direction.y = -direction.y;
     
         cachedTransform.position = Camera.main.ViewportToWorldPoint(viewPos);
     }
     
     protected virtual void Start()
     {
         speed = Random.Range(minSpeed, maxSpeed);
         InitDirection();
     }
     
     protected virtual void Update()
     {
         Move();
     }
     
     protected virtual void InitDirection()
     {
         // give random orientation
         float randZ = Random.Range(minInitialOrientation, maxInitialOrientation);
         direction = Quaternion.Euler(0, 0, randZ) * cachedTransform.right;
     }
     
     protected abstract float GetY();
 }

In your case, you want sine movement, so (attach this to your bats):

 using UnityEngine;
 using System.Collections;
 
 public class SineWaveMovement : BaseMovement
 {
     [SerializeField]
     private GameObject trail; // just for fun
     [SerializeField]
     private float frequency = 1f;
     [SerializeField]
     private float wavelength = 1f;
 
     protected override float GetY()
     {
         // try and mess with some of the values here to see what dif results you get...
         return Mathf.Sin(2 * Mathf.PI * Time.time * frequency) * wavelength;
     }
 
     protected override void Move()
     {
         base.Move();
         StartCoroutine(CreateTrail());
     }
     
     private IEnumerator CreateTrail()
     {
         if (trail != null)
         {
                 var tObj = Instantiate(trail, cachedTransform.position, cachedTransform.rotation);
                 yield return new WaitForSeconds(3f);
                 Destroy(tObj);
         }
     }
 }

Resulting movement:

Linear movement is as easy as:

 public class LinearMovement : BaseMovement
 {
     protected override float GetY()
     {
         return velocity.y;
     }
 }

For a circular movement, check this out.