starfighter/Starfighter/script/ui/pause_menu.cs

using Godot;
using System;

public partial class pause_menu : CenterContainer
{
    private Button _resumeButton;
    private Button _quitButton;
    private Button _inputButton;
    
    private input_menu _inputMenu;
    
    public override void _Ready()
    {
        _resumeButton = GetNode<Button>("VBox/HBox/ResumeButton");
        _quitButton = GetNode<Button>("VBox/HBox/QuitButton");
        _inputButton = GetNode<Button>("VBox/HBox/InputsButton");
        _inputMenu = GetNode<input_menu>("InputMenu");

        _resumeButton.Pressed += () =>
        {
            Visible = false;
            GetTree().Paused = false;
        };

        _inputButton.Pressed += () =>
        {
            _inputMenu.ShowInputPanel();
        };
        
        _quitButton.Pressed += () =>
        {
            GetTree().Paused = false;
            GetTree().ChangeSceneToFile("res://scenes/ui/main_menu.tscn");
        };
    }
}