keep-everything-alive/Assets/Scripts/Microgame_Earth/FollowMouse.cs

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

[RequireComponent(typeof(Rigidbody2D))]
public class FollowMouse : MonoBehaviour
{
    public Vector2 min;
    public Vector2 max;

    private new Rigidbody2D rigidbody2D;

    void Awake() {
        rigidbody2D = GetComponent<Rigidbody2D>();
    }

    void Start() {
        Vector3 screenPoint = Camera.main.ScreenToWorldPoint(Input.mousePosition);
        transform.position = new Vector3(Mathf.Clamp(screenPoint.x, min.x, max.x), Mathf.Clamp(screenPoint.y, min.y, max.y), transform.position.z);
    }

    void FixedUpdate()
    {
        Vector3 screenPoint = Camera.main.ScreenToWorldPoint(Input.mousePosition);
        rigidbody2D.MovePosition(new Vector3(Mathf.Clamp(screenPoint.x, min.x, max.x), Mathf.Clamp(screenPoint.y, min.y, max.y), transform.position.z));
    }
}