Added booster scripts and incomplete score and oxygen scripts.

Assets/Scripts/Clock.cs

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+using System.Collections;
+using System.Collections.Generic;
+using System.Security.Cryptography;
+using UnityEngine;
+
+public class Clock : MonoBehaviour
+{
+    public AudioSource collectSound;
+    public Transform player; 
+    public SlowDownTime timeSlower;
+
+    void OnTriggerEnter(Collider other)
+    {
+        if (other.transform == player)
+        {
+            collectSound.Play();
+            timeSlower.DoSlowmotion();
+            Destroy(gameObject);
+        }
+
+    }
+}

Assets/Scripts/Oxygen.cs

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+using System.Collections;
+using System.Collections.Generic;
+using UnityEngine;
+
+public class Oxygen : MonoBehaviour
+{
+    public AudioSource collectSound;
+    static float oxyLevel;
+    // Start is called before the first frame update
+    void Start()
+    {
+
+    }
+
+    // Update is called once per frame
+    void Update()
+    {
+
+    }
+}

Assets/Scripts/RefillOxygen.cs

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+using System.Collections;
+using System.Collections.Generic;
+using System.Threading;
+using UnityEngine;
+
+public class RefillOxygen : MonoBehaviour
+{
+    public AudioSource collectSound;
+    public float capacity;
+
+    void OnTriggerEnter(Collider other)
+    {
+        if (other.transform == player)
+        {
+            collectSound.Play();
+            Oxygen.oxyLevel = capacity;
+            Destroy(gameObject);
+        }
+    }
+}

Assets/Scripts/Score.cs

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+using System.Collections;
+using System.Collections.Generic;
+using System.Threading;
+using UnityEngine;
+
+public class Score : MonoBehaviour
+{
+    static float scoreRate = 1;
+    // Start is called before the first frame update
+    void Start()
+    {
+
+    }
+
+    // Update is called once per frame
+    void Update()
+    {
+        if (ScoreMultiplier.hasHit && !Timer.running)
+        {
+            scoreRate = 1;
+        }
+    }
+}

Assets/Scripts/ScoreMultiplier.cs

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+using System.Collections;
+using System.Collections.Generic;
+using UnityEngine;
+
+public class ScoreMultiplier : MonoBehaviour
+{
+    public AudioSource collectSound;
+    public Transform player;
+
+    bool hasHit = false;
+
+    void OnTriggerEnter(Collider other)
+    {
+        if (other.transform == player)
+        {
+            collectSound.Play();
+            Score.scoreRate=2;
+            hasHit = true;
+            Destroy(gameObject);
+        }
+    }
+}

Assets/Scripts/SlowDownTime.cs

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+
+using UnityEngine;
+
+public class SlowDownTime : MonoBehaviour
+{
+    public float slowdownFactor = 0.05f;
+    public float slowdownLength = 2f;
+
+    void Update()
+    {
+        Time.timeScale += (1f / slowdownLength) * Time.unscaledDeltaTime ;
+        Time.timeScale = Mathf.Clamp(Time.timeScale, 0f, 1f);
+    }
+    public void DoSlowmotion()
+    {
+        Time.timeScale = slowdownFactor;
+        Time.fixedDeltaTime = Time.timeScale * 0.02f;
+    }
+}

Assets/Scripts/Teleport.cs

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+using System;
+using System.Collections;
+using System.Collections.Generic;
+using UnityEngine;
+
+public class Teleport : MonoBehaviour
+{
+    public AudioSource collectSound;
+
+    Animator m_Animator;
+    float Width; //width of game window
+
+    void Start()
+    {
+        m_Animator = GetComponent<Animator>;
+    }
+
+    void OnTriggerEnter(Collider other)
+    {
+        m_Animator.enabled = true;
+        other.transform.position = new Vector3(Random.Range(-Width, Width), 0, other.transform.position.z + 100);
+
+    }
+}

Assets/Scripts/Timer.cs

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+using System.Collections;
+using System.Collections.Generic;
+using UnityEngine;
+
+public class Timer : MonoBehaviour
+{
+    static float timedur = 0f;
+    static bool running = false;
+
+    void Update()
+    {
+        if (running)
+        {
+            timedur += Time.deltaTime;
+        }
+        if (timedur > 100)
+        {
+            running = false;
+            timedur = 0;
+        }
+
+    }
+}