Adding holding spacebar to fire

Assets/Scenes/_Scene_0.unity

@@ -548,6 +548,7 @@ MonoBehaviour:
   gameRestartDelay: 2
   projectilePrefab: {fileID: 390831642383508558, guid: d58eefa3468510199b6e895172b42b17, type: 3}
   projectileSpeed: 40
+  firingDelay: 0.15
   _shieldLevel: 1
 --- !u!1 &1065119440
 GameObject:

Assets/__Scripts/Hero.cs

@@ -14,11 +14,14 @@ public class Hero : MonoBehaviour
     public float gameRestartDelay = 2f;
     public GameObject projectilePrefab;
     public float projectileSpeed = 40;
+    public float firingDelay = 0.02f;
 
     [Header("Set Dynamically")]
     public float _shieldLevel = 1;
     // This variables holds a reference to the last triggering GameObject
     private GameObject lastTriggerGo = null;
+    private bool isFiring = false;
+    private float lastFiringTime = 0;
 
     void Awake() {
         if (S == null) {
@@ -51,7 +54,15 @@ public class Hero : MonoBehaviour
         transform.rotation = Quaternion.Euler(yAxis*pitchMult,xAxis*rollMult,0);
         // Allow the ship to fire
         if (Input.GetKeyDown(KeyCode.Space)) {
+            isFiring = true;
+        }
+        lastFiringTime += Time.deltaTime;
+        if (isFiring && (lastFiringTime > firingDelay)) {
             TempFire();
+            lastFiringTime = 0;
+        }
+        if (Input.GetKeyUp(KeyCode.Space)) {
+            isFiring = false;
         }
     }
 

Assets/__Scripts/Hero.cs~

@@ -0,0 +1,95 @@
+using System.Collections;
+using System.Collections.Generic;
+using UnityEngine;
+
+public class Hero : MonoBehaviour
+{
+    static public Hero S; 
+
+    [Header("Set in Inspector")]
+    // These fields control the movement of the ship
+    public float speed = 30;
+    public float rollMult = -45;
+    public float pitchMult = 30;
+    public float gameRestartDelay = 2f;
+    public GameObject projectilePrefab;
+    public float projectileSpeed = 40;
+
+    [Header("Set Dynamically")]
+    public float _shieldLevel = 1;
+    // This variables holds a reference to the last triggering GameObject
+    private GameObject lastTriggerGo = null;
+
+    void Awake() {
+        if (S == null) {
+            S = this; 
+        } else {
+            Debug.LogError("Hero.Awake() - Attempted to assign second Hero.S!");
+        }
+    }
+
+    // Start is called before the first frame update
+    void Start()
+    {
+        
+    }
+
+    // Update is called once per frame
+    void Update()
+    {
+        // Pull in information from the Input class
+        float xAxis = Input.GetAxis("Horizontal");
+        float yAxis = Input.GetAxis("Vertical");
+
+        // Change transform.position based on the axes
+        Vector3 pos = transform.position;
+        pos.x += xAxis * speed * Time.deltaTime;
+        pos.y += yAxis * speed * Time.deltaTime;
+        transform.position = pos;
+
+        // Rotate the ship to make it feel more dynamic 
+        transform.rotation = Quaternion.Euler(yAxis*pitchMult,xAxis*rollMult,0);
+        // Allow the ship to fire
+        if (Input.GetKeyDown(KeyCode.Space)) {
+            TempFire();
+        }
+    }
+
+    void TempFire() {
+        GameObject projGO = Instantiate<GameObject>(projectilePrefab);
+        projGO.transform.position = transform.position;
+        Rigidbody rigidB = projGO.GetComponent<Rigidbody>();
+        rigidB.velocity = Vector3.up * projectileSpeed;
+    }
+
+    void OnTriggerEnter(Collider other) {
+        Transform rootT = other.gameObject.transform.root;
+        GameObject go = rootT.gameObject;
+        //print("Triggered: " + go.name);
+        // Make sure it's not the same triggering go as last time
+        if (go == lastTriggerGo) {
+            return;
+        }
+        lastTriggerGo = go;
+        if (go.tag == "Enemy") {
+            shieldLevel--;
+            Destroy(go);
+        } else {
+            print("Triggered by non-Enemy: " + go.name);
+        }
+    }
+    public float shieldLevel {
+        get {
+            return(_shieldLevel);
+        }
+        set {
+            _shieldLevel = Mathf.Min(value, 4);
+            // If the shield is going to be set to less than zero
+            if (value < 0) {
+                Destroy(this.gameObject);
+                // Tell Main.S to restart the game after a delay
+                Main.S.DelayedRestart(gameRestartDelay);
+            }
+        }
+    }
+}