diff --git a/source/core/input/input.cpp b/source/core/input/input.cpp
index 2de032e..26acc51 100644
--- a/source/core/input/input.cpp
+++ b/source/core/input/input.cpp
@@ -341,7 +341,7 @@ void Input::resetInputStates() {
         key.second.just_pressed = false;
     }
     // Resetear todos los ControllerBindings.active a false
-    for (auto& gamepad : gamepads_) {
+    for (const auto& gamepad : gamepads_) {
         for (auto& binding : gamepad->bindings) {
             binding.second.is_held = false;
             binding.second.just_pressed = false;
diff --git a/source/core/input/input.hpp b/source/core/input/input.hpp
index 9ac73b9..7159833 100644
--- a/source/core/input/input.hpp
+++ b/source/core/input/input.hpp
@@ -89,7 +89,7 @@ class Input {
                 std::string path;
                 std::unordered_map<Action, ButtonState> bindings;
 
-                Gamepad(SDL_Gamepad* gamepad)
+                explicit Gamepad(SDL_Gamepad* gamepad)
                     : pad(gamepad),
                       instance_id(SDL_GetJoystickID(SDL_GetGamepadJoystick(gamepad))),
                       name(std::string(SDL_GetGamepadName(gamepad))),
diff --git a/source/core/rendering/surface_animated_sprite.hpp b/source/core/rendering/surface_animated_sprite.hpp
index bda954a..1c808b8 100644
--- a/source/core/rendering/surface_animated_sprite.hpp
+++ b/source/core/rendering/surface_animated_sprite.hpp
@@ -46,8 +46,8 @@ class SurfaceAnimatedSprite : public SurfaceMovingSprite {
         // [DOC:29/10/2025] la surface ara se pillarà del .ANI.
         //    Necesite constructors que no requereixquen la surface al crear el objecte,
         //    ja que la trau al llegir el arxiu. Aixó afecta a totes les classes base...
-        SurfaceAnimatedSprite(const std::string& file_path);
-        SurfaceAnimatedSprite(const Animations& animations);
+        explicit SurfaceAnimatedSprite(const std::string& file_path);
+        explicit SurfaceAnimatedSprite(const Animations& animations);
         // [/DOC]
         SurfaceAnimatedSprite(std::shared_ptr<Surface> surface, const std::string& file_path);
         SurfaceAnimatedSprite(std::shared_ptr<Surface> surface, const Animations& animations);
diff --git a/source/core/resources/resource.hpp b/source/core/resources/resource.hpp
index 9219a91..7ebd901 100644
--- a/source/core/resources/resource.hpp
+++ b/source/core/resources/resource.hpp
@@ -51,7 +51,7 @@ struct ResourcePalette {
         Palette palette;   // Paleta
 
         // Constructor
-        ResourcePalette(std::string name, Palette palette)
+        ResourcePalette(std::string name, const Palette& palette)
             : name(std::move(name)),
               palette(palette) {}
 };
diff --git a/source/game/entities/player.cpp b/source/game/entities/player.cpp
index 5cc9268..e6992b1 100644
--- a/source/game/entities/player.cpp
+++ b/source/game/entities/player.cpp
@@ -525,8 +525,6 @@ void Player::playFallSound() {
 // Comprueba si el jugador tiene suelo debajo de los pies
 auto Player::isOnFloor() -> bool {
     bool on_floor = false;
-    bool on_slope_l = false;
-    bool on_slope_r = false;
 
     updateFeet();
 
@@ -537,8 +535,8 @@ auto Player::isOnFloor() -> bool {
     }
 
     // Comprueba las rampas
-    on_slope_l = room_->checkLeftSlopes(under_feet_.data());
-    on_slope_r = room_->checkRightSlopes(&under_feet_[1]);
+    auto on_slope_l = room_->checkLeftSlopes(under_feet_.data());
+    auto on_slope_r = room_->checkRightSlopes(&under_feet_[1]);
 
     return on_floor || on_slope_l || on_slope_r;
 }
diff --git a/source/game/gameplay/cheevos.cpp b/source/game/gameplay/cheevos.cpp
index ec357aa..10fd4a9 100644
--- a/source/game/gameplay/cheevos.cpp
+++ b/source/game/gameplay/cheevos.cpp
@@ -2,9 +2,10 @@
 
 #include <SDL3/SDL.h>
 
-#include <cstddef>   // Para NULL
-#include <fstream>   // Para basic_ostream, operator<<, basic_ofstream
-#include <iostream>  // Para cout, cerr
+#include <algorithm>  // Para std::count_if
+#include <cstddef>    // Para NULL
+#include <fstream>    // Para basic_ostream, operator<<, basic_ofstream
+#include <iostream>   // Para cout, cerr
 #include <utility>
 
 #include "game/options.hpp"      // Para Options, options
@@ -159,13 +160,8 @@ void Cheevos::saveToFile() {
 
 // Devuelve el número total de logros desbloqueados
 auto Cheevos::getTotalUnlockedAchievements() -> int {
-    int count = 0;
-    for (const auto& cheevo : cheevos_list_) {
-        if (cheevo.completed) {
-            count++;
-        }
-    }
-    return count;
+    return std::count_if(cheevos_list_.begin(), cheevos_list_.end(),
+                         [](const auto& cheevo) { return cheevo.completed; });
 }
 
 // Elimina el estado "no obtenible"
diff --git a/source/game/scenes/loading_screen.cpp b/source/game/scenes/loading_screen.cpp
index aadcd29..57409af 100644
--- a/source/game/scenes/loading_screen.cpp
+++ b/source/game/scenes/loading_screen.cpp
@@ -288,20 +288,17 @@ void LoadingScreen::renderHeaderBorder() const {
     const auto COLOR = carrier_.toggle ? static_cast<Uint8>(PaletteColor::RED) : static_cast<Uint8>(PaletteColor::CYAN);
     const int WIDTH = Options::game.width + (Options::video.border.width * 2);
     const int HEIGHT = Options::game.height + (Options::video.border.height * 2);
-    bool draw_enabled = true;
-
+    
     // Primera linea (con el color y tamaño de la portadora)
     int row = 0;
     const int FIRST_ROW_HEIGHT = static_cast<int>(carrier_.offset);
-    if (draw_enabled) {
-        for (int i = row; i < row + FIRST_ROW_HEIGHT; ++i) {
-            border->drawLine(0, i, WIDTH, i, COLOR);
-        }
+    for (int i = row; i < row + FIRST_ROW_HEIGHT; ++i) {
+        border->drawLine(0, i, WIDTH, i, COLOR);
     }
     row += FIRST_ROW_HEIGHT;
-    draw_enabled = !draw_enabled;
-
+    
     // Resto de lineas (siguen a la portadora)
+    bool draw_enabled = false;
     while (row < HEIGHT) {
         if (draw_enabled) {
             for (int i = row; i < row + HEADER_DATAROW_HEIGHT; ++i) {