Main menu, ZX Spectrum-like font, Death screen, Fixed typo, Game Manager

scripts/GameManager.cs

@@ -0,0 +1,38 @@
+using System;
+using Godot;
+
+public partial class GameManager : Node
+{
+	public static bool IsPlaying = true;
+	
+	public ulong GameStart = 0;
+	public ulong GameEnd = 0;
+	public int Attempts = 0;
+	public Node2D Checkpoint = null;
+
+	[Signal]
+	public delegate void GameOverEventHandler();
+
+	public override void _Ready()
+	{
+		if (!IsPlaying)
+		{
+			IsPlaying = true;
+		}
+		
+		StartGame();
+	}
+
+	public void StartGame() => GameStart = Time.GetTicksMsec();
+
+	public void EndGame()
+	{
+		GameEnd = Time.GetTicksMsec();
+
+		EmitSignal(SignalName.GameOver);
+	}
+
+	public string GetFormattedTimeElapsed() => TimeSpan.FromMilliseconds(GameEnd - GameStart).ToString(@"hh\:mm\:ss.fff");
+
+	public void OnPlayerDied() => Attempts++;
+}