Central class for SFML game engine

Question

I have worked on a SFML Game/Game-Engine Project for 2 months now and am looking for some feedback in terms of...

• Is this a valid approach for a Game class?
• Are there any glaring C++ coding practice mistakes?

The following code is from my Game class which is the main organizational unit of the Game/Engine. I use a Scene(State) approach, meaning that every Scene/Screen in the Game is a closed of unit with it's Entities being updated from the Game class.

Game.h

#ifndef GAME_H
#define GAME_H

#include <SFML/Graphics/Drawable.hpp>
#include <SFML/Graphics/RenderWindow.hpp>
#include <string>
#include <vector>
#include <map>

#include "../game/Entity.h"
#include "../game/FpsCounter.h"
#include "../game/EScene.h"
#include "../game/Scene.h"
#include "../game/InputHandler.h"
#include "../game/WindowStyle.h"
#include "../menu/VBox.h"
#include "../menu/HBox.h"
#include "../menu/ButtonMenu.h"
#include "../animation/TranslateAnimation.h"

namespace ProjectSpace
{
/**
 * @brief      Core class of the Game. Contains main Game-Loop and Event-Loop.
 */
class Game
{
public:

    /**
     * @brief      Constructs a Game detecting the monitor's resolution automatically.
     *
     * @param[in]  windowTitle  Title of the Game's window.
     */
    Game(std::string windowTitle, WindowStyle style = DEFAULT);

    /**
     * @brief      Constructs a Game.
     *
     * @param[in]  screenWidth   Width of the Game's window.
     * @param[in]  screenHeight  Height of the Game's window.
     * @param[in]  windowTitle   Title of the Game's window.
     */
    Game(unsigned int screenWidth, unsigned int screenHeight, std::string windowTitle, WindowStyle style = DEFAULT);

    /**
     * @brief      Destroys every Scene of the Game.
     */
    ~Game();

    /**
     * @brief      Starts the Game/Game-Loop.
     */
    void start();

    /**
     * @brief      Sets the current scene.
     *
     * @param[in]  scene  The scene
     */
    void setCurrentScene(EScene scene);

private:
    /**
     * @brief      Helper function for initializing everything before starting the Game. Creates all Sprites and stuff...
     */
    void init();

    sf::RenderWindow window;         // Window of the Game.
    FpsCounter fpsCounter;           // Fps Counter of the Game.
    InputHandler inputHandler;       // InputHandler for input Actions that are always available in the game (Not Scene dependant).
    VBox menu;
    std::map<EScene, Scene*> scenes; // All Scenes of the Game.
    Scene* currentScene;             // Scene that is currently active (is drawn and updated).

    TranslateAnimation* menuForward;
    TranslateAnimation* menuBackward;
    ButtonMenu* buttonMenu;

    float windowWidth;
    float windowHeight;
    };
}

#endif

Game.cpp

#include "Game.h"

#include <SFML/System/Clock.hpp>
#include <SFML/Window/Event.hpp>
#include <SFML/Window/VideoMode.hpp>

#include "../menu/TextBox.h"
#include "../animation/FadeAnimation.h"
#include "../menu/Button.h"
#include "../menu/ButtonMenu.h"
#include "InputHandler.h"
#include "Scene.h"
#include "Factory.h" 

namespace ProjectSpace
{
Game::Game(std::string windowTitle, WindowStyle style)
: window{sf::VideoMode{sf::VideoMode::getDesktopMode().width, sf::VideoMode::getDesktopMode().height}, windowTitle, style},
fpsCounter{"rsrc/fonts/arial.ttf"}, currentScene{nullptr}, windowWidth{(float)sf::VideoMode::getDesktopMode().width},
windowHeight{(float)sf::VideoMode::getDesktopMode().height}
{
    window.setFramerateLimit(60);

    init();
}

Game::Game(unsigned int screenWidth, unsigned int screenHeight, std::string windowTitle, WindowStyle style) 
: window{sf::VideoMode{screenWidth, screenHeight}, windowTitle, style}, fpsCounter{"rsrc/fonts/arial.ttf"},
currentScene{nullptr}
{
    // Makes sure that not more than 60 Frames per Second are calculated. Save Ressources.
    window.setFramerateLimit(60);

    init();
}

Game::~Game()
{
    for (auto const& p : scenes)
    {
        delete p.second;
    }
}

void Game::start()
{
    sf::Clock clock{};

    // This is main Game-Loop
    while (window.isOpen())
    {
        // At the start of each iteration "clock.restart()" will return the time that the last iteration took.
        // This is so that all objects of the current iteration know how much time has passed since the last frame.
        sf::Time time = clock.restart();
        float frameTime = time.asSeconds();

        // std::cout << "frameTime: " << frameTime << std::endl;

        // This is the Event-Loop (Hier muessen wir nochmal gucken, was wir damit anstellen koennen. Ist wohl ziemlich wichtig in SFML.)
        sf::Event event;
        while (window.pollEvent(event))
        {
            // For example by pressing the Close-Button on a Window, a Closed Event is created.
            if (event.type == sf::Event::Closed)
            {
                window.close();
            }
        }

        currentScene->update(time);

        inputHandler.update(time);
        fpsCounter.update(time);
        menu.update(time);
        menuForward->update(time);
        menuBackward->update(time);
        buttonMenu->update(time);

        // Default way of drawing stuff in SFML. Clear the window, draw you'r stuff and then display it.
        window.clear();

        window.draw(*currentScene);
        window.draw(fpsCounter);
        window.draw(menu);

        window.display();
    }
}

void Game::setCurrentScene(EScene scene)
{
    if (scenes.count(scene) == 0)
    {
        std::cout << "@Game::setCurrentScene(): Given scene is not known to Game." << std::endl;
        return;
    }

    currentScene = scenes[scene];
}

void Game::init()
{
    // Creating Levels
    scenes[EScene::DEBUG] = Factory::CREATE_DEBUG_SCENE(window);
    scenes[EScene::LEVEL_ONE] = Factory::CREATE_DEBUG_SCENE_2(window);
    currentScene = scenes[EScene::DEBUG];

    // Creating Menu
    Button* btn = new Button{[this]()
    {
        window.close();
    }, window, "EXIT"};

    Button* btn2 = new Button{[this]()
    {
        window.close();
    }, window, "EXIT"};

    Button* btn3 = new Button{[this]()
    {
        setCurrentScene(EScene::DEBUG);
    }, window, "Debug Level"};

    Button* btn4 = new Button{[this]()
    {
        setCurrentScene(EScene::LEVEL_ONE);
    }, window, "Level 1"};

    menu.addMenuElements({btn, btn2, btn3, btn4});
    menu.setPosition(-10, 50);
    menu.setSpacing(5);

    buttonMenu = new ButtonMenu{{btn, btn2, btn3, btn4}, &inputHandler};

    menuForward = new TranslateAnimation{&menu, sf::Vector2f{-250, 50}, sf::Vector2f{-10, 50}, 0.5f};
    menuBackward = new TranslateAnimation{&menu, sf::Vector2f{-10, 50}, sf::Vector2f{-250, 50}, 0.5f};

    // Setting up input handler
    inputHandler.add([this]()
    {
        if (sf::Keyboard::isKeyPressed(sf::Keyboard::Escape))
        {
            window.close();
        }

        if (sf::Keyboard::isKeyPressed(sf::Keyboard::E))
        {
            menuBackward->stop();
            menuForward->start();
        }

        if (sf::Keyboard::isKeyPressed(sf::Keyboard::R))
        {
            menuForward->stop();
            menuBackward->start();
        }
    });
}
}

GitHub Repo: https://github.com/Dante3085/ProjectSpace