diff --git a/src/Map.cpp b/src/Map.cpp
index c472f1e..0ab4085 100644
--- a/src/Map.cpp
+++ b/src/Map.cpp
@@ -28,7 +28,7 @@ Map::Map(GameRenderer *renderer, int tile_size) :
     }
 }
 
-std::vector<Tile> Map::generate_tiles(std::vector<Tile> prev_tiles) const
+std::vector<Tile> Map::generate_tiles(const std::vector<Tile> &prev_tiles) const
 {
     std::vector<Tile> new_tiles = std::vector(prev_tiles.size(), Tile::grass);
 
diff --git a/src/Map.hpp b/src/Map.hpp
index efe0f6c..5712c5a 100644
--- a/src/Map.hpp
+++ b/src/Map.hpp
@@ -18,7 +18,7 @@ private:
     Sprite grass_sprite;
     Sprite path_sprite;
 
-    std::vector<Tile> generate_tiles(std::vector<Tile> prev_tiles) const;
+    [[nodiscard]] std::vector<Tile> generate_tiles(const std::vector<Tile> &prev_tiles) const;
 
 public:
     Map(GameRenderer *renderer, int tile_size);
diff --git a/src/Player.hpp b/src/Player.hpp
index 6932f1e..c1c0728 100644
--- a/src/Player.hpp
+++ b/src/Player.hpp
@@ -18,7 +18,7 @@ public:
 
     double angle = 0.0;
 
-    const double speed = 1.5;
+    static constexpr double speed = 1.5;
 
     Player(GameRenderer *renderer);
 
diff --git a/src/main.cpp b/src/main.cpp
index a3059ad..f394338 100644
--- a/src/main.cpp
+++ b/src/main.cpp
@@ -5,8 +5,7 @@ int main()
 {
 	srand(time(nullptr));
 
-	Game game = Game();
-
+	Game game;
 	game.run();
 
 	return 0;