quick fix

src/game/game.cpp

@@ -18,6 +18,7 @@ game::game(uint32_t fps):current_state(),
                          shoot_control(nullptr),
                          player_position_delta(0),
                          player_angle_delta(0.0),
+                         player_force_delta(0.0),
                          delta_time(1.0 / static_cast<double>(fps)),
                          is_running(false),
                          shoot(false) {