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I'm glad you enjoyed it! 

Here's some code for you for the audio sync stuff - it's pretty straightforward, feel free to ask any questions:

public class IntEvent : UnityEvent<int>{ }
public class AudioBeatManager : MonoBehaviour
{
    [SerializeField] private float bpm;
    private float _secPerBeat;
    public float TimeBetweenBeats => _secPerBeat;
    private int _currentBeat = 0;
    private float _timer;
    [SerializeField] private IntEvent onBeat;
    public IntEvent OnBeat => onBeat;
    public event Action<int> OnBeatEvent;
    private float _initialPower;
    private float _startTime;
    public float DspTime => (float) AudioSettings.dspTime - _startTime;
    private void Awake()
    {
        _secPerBeat = 60f / bpm;
    }
    private void OnEnable()
    {
        _startTime = (float) AudioSettings.dspTime;
        _currentBeat = 0;
    }
    private void Start()
    {
        _timer = 0;
    }
    public void SetBPM(int newBpm, bool resetCurrentBeat = false)
    {
        bpm = newBpm;
        _secPerBeat = 60f / bpm;
        if (resetCurrentBeat)
            _currentBeat = 0;
        Start();
    }
    public void DoReset()
    {
        bpm = _originalBpm;
        _secPerBeat = 60f / bpm;
        Start();
        _currentBeat = 0;
        _startTime = (float) AudioSettings.dspTime;
    }
    void Update()
    {
        // new beats
        var beatsElapsed = (int)(DspTime / TimeBetweenBeats);
        var lastBeatTime = beatsElapsed * TimeBetweenBeats;
        var timeSinceLastBeat = DspTime - lastBeatTime;
        if (beatsElapsed > _currentBeat)
        {
            // a beat gone done did do happen
            // account for this frame being a little bit past the beat!
            _timer = timeSinceLastBeat;
            ++_currentBeat;
            if (Time.timeScale == 0)
                return;
            OnBeat?.Invoke(_currentBeat);
            OnBeatEvent?.Invoke(_currentBeat);
        }
    }
}

I've stripped out a couple of things you wont need, so if there are any errors let me know what they are xD it's probably because I've taken something important out ;)