Some things

Assets/Scripts/Level 5/PlayerMovement5.cs

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+using UnityEngine;
+using UnityEngine.InputSystem;
+
+namespace Level5 {
+    public class PlayerMovement5 : PlayerStats {
+    
+        [Header("Shooting")]
+        [SerializeField] Bullet5 bullet;
+        [SerializeField] Transform shootingPos;
+    
+        [Header("Physics")] 
+        [SerializeField] LayerMask groundMask;
+        [SerializeField] Vector2 feetSize;
+    
+        float _horizontalInput;
+        float _xVelocity, _accelerationVelocity;
+        float _currentCoyoteTime, _currentBufferTime;
+        bool _grounded;
+
+        int _facingDirection = 1;
+
+        PlayerInput _playerInput;
+
+        [Header("Animations")] 
+        [SerializeField] Animator animator;
+        public Animator Animator => animator;
+
+        public static readonly int Jump1 = Animator.StringToHash("Jump");
+        static readonly int XVelocity = Animator.StringToHash("xVelocity");
+        static readonly int YVelocity = Animator.StringToHash("yVelocity");
+        static readonly int Grounded = Animator.StringToHash("Grounded");
+
+        void Awake() {
+            _playerInput = new PlayerInput();
+        
+            _playerInput.Gameplay.Horizontal.started += HorizontalHandler;
+            _playerInput.Gameplay.Horizontal.performed += HorizontalHandler;
+            _playerInput.Gameplay.Horizontal.canceled += HorizontalHandler;
+
+            _playerInput.Gameplay.Jump.started += Jump;
+            _playerInput.Gameplay.Jump.canceled += Jump;
+        
+            _playerInput.Gameplay.Fire.performed += Fire;
+        }
+
+        void Jump(InputAction.CallbackContext obj) {
+            if (obj.started) {
+                _currentBufferTime = bufferTime;
+            }else if (obj.canceled) {
+                if (Rb.velocity.y < 0f) return;
+                Rb.velocity = new Vector2(Rb.velocity.x, Rb.velocity.y * jumpCancellationMultiplier);
+            }
+        }
+
+        void Fire(InputAction.CallbackContext obj) {
+            Bullet5 bullet5 = Instantiate(bullet, shootingPos.position, Quaternion.identity);
+            bullet5.AddForce(_facingDirection);
+        }
+    
+        void HorizontalHandler(InputAction.CallbackContext obj) {
+            _horizontalInput = obj.ReadValue<float>();
+            _facingDirection = _horizontalInput > 0 ? 1 : _horizontalInput < 0 ? -1 : _facingDirection;
+            transform.localScale = new Vector3(_facingDirection, 1, 1);
+        }
+    
+        void OnEnable() {
+            _playerInput.Enable();
+        }
+
+        void OnDisable() {
+            _playerInput.Disable();
+        }
+
+        // Update is called once per frame
+        void Update() {
+            animator.SetFloat(XVelocity, Mathf.Abs(_xVelocity));
+            animator.SetFloat(YVelocity, Rb.velocity.y);
+            animator.SetBool(Grounded, _grounded);
+
+            if (_currentBufferTime > 0f && _currentCoyoteTime > 0f) {
+                Rb.velocity = new Vector2(Rb.velocity.x, jumpForce);
+                animator.SetTrigger(Jump1);
+
+                _currentBufferTime = _currentCoyoteTime = 0f;
+            }
+
+            _currentCoyoteTime -= Time.deltaTime;
+            _currentBufferTime -= Time.deltaTime;
+        }
+
+        void FixedUpdate() {
+            _grounded = Physics2D.OverlapBox(transform.position, feetSize, 0, groundMask);
+            if (_grounded && Rb.velocity.y < .1f)
+                _currentCoyoteTime = coyoteTime;
+
+            _xVelocity = Rb.velocity.x;
+            _xVelocity = Mathf.SmoothDamp(_xVelocity, _horizontalInput * speed, ref _accelerationVelocity,
+                acceleration);;
+            Rb.velocity = new Vector2(_xVelocity, Rb.velocity.y);
+        }
+
+        void OnDrawGizmos() {
+            Gizmos.color = Color.red;
+            Gizmos.DrawWireCube(transform.position, feetSize);
+        }
+    }
+}