Add project files.

AlienAttack.sln

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+
+Microsoft Visual Studio Solution File, Format Version 12.00
+# Visual Studio Version 17
+VisualStudioVersion = 17.14.36301.6 d17.14
+MinimumVisualStudioVersion = 10.0.40219.1
+Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "AlienAttack.MonoGame", "AlientAttack.MonoGame\AlienAttack.MonoGame.csproj", "{BC3CF028-D58E-4F16-AC13-E4630A2A5B47}"
+EndProject
+Global
+	GlobalSection(SolutionConfigurationPlatforms) = preSolution
+		Debug|Any CPU = Debug|Any CPU
+		Release|Any CPU = Release|Any CPU
+	EndGlobalSection
+	GlobalSection(ProjectConfigurationPlatforms) = postSolution
+		{BC3CF028-D58E-4F16-AC13-E4630A2A5B47}.Debug|Any CPU.ActiveCfg = Debug|Any CPU
+		{BC3CF028-D58E-4F16-AC13-E4630A2A5B47}.Debug|Any CPU.Build.0 = Debug|Any CPU
+		{BC3CF028-D58E-4F16-AC13-E4630A2A5B47}.Release|Any CPU.ActiveCfg = Release|Any CPU
+		{BC3CF028-D58E-4F16-AC13-E4630A2A5B47}.Release|Any CPU.Build.0 = Release|Any CPU
+	EndGlobalSection
+	GlobalSection(SolutionProperties) = preSolution
+		HideSolutionNode = FALSE
+	EndGlobalSection
+	GlobalSection(ExtensibilityGlobals) = postSolution
+		SolutionGuid = {DA3D7BFD-2DB6-4F8A-B9B8-9C563E931D2C}
+	EndGlobalSection
+EndGlobal

AlientAttack.MonoGame/.config/dotnet-tools.json

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+{
+  "version": 1,
+  "isRoot": true,
+  "tools": {
+    "dotnet-mgcb": {
+      "version": "3.8.4",
+      "commands": [
+        "mgcb"
+      ]
+    },
+    "dotnet-mgcb-editor": {
+      "version": "3.8.4",
+      "commands": [
+        "mgcb-editor"
+      ]
+    },
+    "dotnet-mgcb-editor-linux": {
+      "version": "3.8.4",
+      "commands": [
+        "mgcb-editor-linux"
+      ]
+    },
+    "dotnet-mgcb-editor-windows": {
+      "version": "3.8.4",
+      "commands": [
+        "mgcb-editor-windows"
+      ]
+    },
+    "dotnet-mgcb-editor-mac": {
+      "version": "3.8.4",
+      "commands": [
+        "mgcb-editor-mac"
+      ]
+    }
+  }
+}

AlientAttack.MonoGame/.vscode/launch.json

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+{
+    // Use IntelliSense to learn about possible attributes.
+    // Hover to view descriptions of existing attributes.
+    // For more information, visit: https://go.microsoft.com/fwlink/?linkid=830387
+    "version": "0.2.0",
+    "configurations": [
+      {
+        "name": "C#: AlientAttack.MonoGame Debug",
+        "type": "dotnet",
+        "request": "launch",
+        "projectPath": "${workspaceFolder}/AlientAttack.MonoGame.csproj"
+      }
+    ],
+  }

AlientAttack.MonoGame/AlienAttack.MonoGame.csproj

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+<Project Sdk="Microsoft.NET.Sdk">
+  <PropertyGroup>
+    <OutputType>WinExe</OutputType>
+    <TargetFramework>net8.0</TargetFramework>
+    <RollForward>Major</RollForward>
+    <PublishReadyToRun>false</PublishReadyToRun>
+    <TieredCompilation>false</TieredCompilation>
+  </PropertyGroup>
+  <PropertyGroup>
+    <ApplicationManifest>app.manifest</ApplicationManifest>
+    <ApplicationIcon>Icon.ico</ApplicationIcon>
+  </PropertyGroup>
+  <ItemGroup>
+    <None Remove="Icon.ico" />
+    <None Remove="Icon.bmp" />
+  </ItemGroup>
+  <ItemGroup>
+    <EmbeddedResource Include="Icon.ico">
+      <LogicalName>Icon.ico</LogicalName>
+    </EmbeddedResource>
+    <EmbeddedResource Include="Icon.bmp">
+      <LogicalName>Icon.bmp</LogicalName>
+    </EmbeddedResource>
+  </ItemGroup>
+  <ItemGroup>
+    <PackageReference Include="MonoGame.Framework.DesktopGL" Version="3.8.*" />
+    <PackageReference Include="MonoGame.Content.Builder.Task" Version="3.8.*" />
+  </ItemGroup>
+  <Target Name="RestoreDotnetTools" BeforeTargets="CollectPackageReferences">
+    <Message Text="Restoring dotnet tools (this might take a while depending on your internet speed and should only happen upon building your project for the first time, or after upgrading MonoGame, or clearing your nuget cache)" Importance="High" />
+    <Exec Command="dotnet tool restore" />
+  </Target>
+</Project>

AlientAttack.MonoGame/AlienAttackGame.cs

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+using AlienAttack.MonoGame.GameLoops;
+using AlienAttack.MonoGame.View;
+using Microsoft.Xna.Framework;
+using Microsoft.Xna.Framework.Graphics;
+using Microsoft.Xna.Framework.Input;
+using System;
+using System.Runtime.InteropServices;
+
+namespace AlienAttack.MonoGame;
+
+public class AlienAttackGame : Game
+{
+    private readonly GraphicsDeviceManager _graphics;
+    private readonly ViewTransform _viewTransform;
+
+    private SpriteBatch _spriteBatch;
+    private GameLoop _gameLoop;
+
+    public SpriteBatch SpriteBatch => _spriteBatch;
+    public ViewTransform ViewTransform => _viewTransform;
+
+    private const string SDL = "SDL2.dll";
+
+    [DllImport(SDL, CallingConvention = CallingConvention.Cdecl)]
+    public static extern void SDL_MaximizeWindow(IntPtr window);
+
+    public AlienAttackGame()
+    {
+        _graphics = new GraphicsDeviceManager(this);
+        _viewTransform = new(this, _graphics);
+        Content.RootDirectory = "Content";
+        IsMouseVisible = true;
+    }
+
+    protected override void Initialize()
+    {
+        // TODO: Add your initialization logic here
+        ConfigureWindow();
+        SetResolution();
+
+        IsFixedTimeStep = true;  //Force the game to update at fixed time intervals
+        TargetElapsedTime = TimeSpan.FromSeconds(1 / 120.0f);  //Se
+
+        base.Initialize();
+
+        MaximizeWindow();
+    }
+
+    private void ConfigureWindow()
+    {
+        Window.AllowUserResizing = true;
+    }
+
+    private void SetResolution()
+    {
+        _graphics.PreferredBackBufferWidth = 1280;
+        _graphics.PreferredBackBufferHeight = 720;
+        _graphics.ApplyChanges();
+    }
+
+    private void MaximizeWindow()
+    {
+        SDL_MaximizeWindow(Window.Handle);
+    }
+
+    protected override void LoadContent()
+    {
+        _spriteBatch = new SpriteBatch(GraphicsDevice);
+        _gameLoop = new GameLoop(this);
+        // TODO: use this.Content to load your game content here
+    }
+
+    protected override void Update(GameTime gameTime)
+    {
+        if (GamePad.GetState(PlayerIndex.One).Buttons.Back == ButtonState.Pressed || Keyboard.GetState().IsKeyDown(Keys.Escape))
+            Exit();
+
+        // TODO: Add your update logic here
+        _gameLoop.Update(gameTime);
+
+        base.Update(gameTime);
+    }
+
+    protected override void Draw(GameTime gameTime)
+    {
+        GraphicsDevice.Clear(Color.Black);
+
+        // TODO: Add your drawing code here
+        _gameLoop.Draw();
+
+        base.Draw(gameTime);
+    }
+}