SchoolFightingSimple/Assets/Scripts/PlayerMovement.cs

using Unity.Mathematics;
using UnityEngine;

public class PlayerMovement : MonoBehaviour
{
    Vector2 spawnedPosition;

    public float moveSpeed = 500f;
    public float jumpForce = 10f;  // The force applied when jumping
    public bool isGrounded = false;  // To check if the character is on the ground
    Rigidbody2D rb;

    public float maxSpeed = 5f;

    // Start is called before the first frame update
    void Start()
    {
        rb = GetComponent<Rigidbody2D>();
        spawnedPosition = transform.position;
    }

    // Update is called once per frame
    void Update()
    {
        // Check for ground contact using raycast
        isGrounded = true;

        // Resets the player pos
        if (Input.GetKeyDown(KeyCode.Backspace)) 
        {
            transform.position = spawnedPosition;
            rb.velocity = Vector3.zero;
        }

        if (Input.GetKey(KeyCode.A))
            rb.AddForce(Vector2.left * (Time.deltaTime * moveSpeed));
        if (Input.GetKey(KeyCode.D))
            rb.AddForce(Vector2.right * (Time.deltaTime * moveSpeed));

        // Jumping
        if (isGrounded && Input.GetKeyDown(KeyCode.Space))
        {
            rb.AddForce(Vector2.up * jumpForce, ForceMode2D.Impulse);
        }

        // Clamps speed
        if (math.abs(rb.velocity.x) > maxSpeed)
            rb.velocity = new Vector2((rb.velocity.x / math.abs(rb.velocity.x)) * maxSpeed, rb.velocity.y);
    }
}