Adding finishing details to the game

The game is now functionally complete, but there are a few elements left to polish up. To start, the player takes damage but never dies, nor is there a heads-up display (HUD) to show this. Let's create a quick Overlord.

1. Create a new Object, obj_Overlord, with no sprite applied and persistence is checked.

2. Add a Draw GUI event and a new Script for it, scr_Overlord_DrawGUI, with the following code:

   draw_healthbar(0, 0, 200, 16, health, c_black, c_red, c_green, 0, true, true);
   
   if (health <= 0)
   {
       with (obj_Player) { instance_destroy(); }
       room_goto(TitleScreen);
       instance_destroy();
   }

   First, we use the function draw_healthbar which you can see has a lot of parameters. The first four are the size and placement of a rectangular bar. Next is the variable to be used for how full the bar is, in our case, the global health variable. The next three are the background color, and the min/max colors. Next is the direction the bar should fall, zero being to...