I have a programing question that isn't clarified by the app if its OK to ask here: 

In lesson 14 the practice where we make the robot take half damage, the if statement where we make the robot  take damage half damage if their level is above level 2 only works if that if statement is the first thing written in the take_damage function. Why does it only work in that order.

Example:

var level = 3

var health = 100

var max_health = 100

func take_damage(amount):

    health -= amount

    if health < 0:

        health = 0

    if level > 2:

        amount *= 0.5

^ This doesn't work.

========================

var level = 3

var health = 100

var max_health = 100

func take_damage(amount):

    if level > 2:

        amount *= 0.5

    health -= amount

    if health < 0:

        health = 0

^ This does work.

I think you should really warn any beginner to also see the full Godot documentation if he wants to really create with Godot engine, or at least put a link to it:
https://docs.godotengine.org/en/4.4/index.html
And in particular, the key concepts overview in it:
https://docs.godotengine.org/en/4.4/getting_started/introduction/key_concepts_ov...
And/or the 2D example tutorial:
https://docs.godotengine.org/en/4.4/getting_started/first_2d_game/index.html

Because I bet whoever discover Godot with this learning game and jump joyfully straight to the Godot editor will bang his head against a brick wall, like I did. After I played this I was confident as it's just your well-known programming, but I was completely lost when I went to the editor for the first time.
I am not talking about the range of buttons that can look impressive. I was stuck having just 'nodes' on a plan, and nothing else. When I started a script it began with a curious 'extand node'. I searched how to have something like the robot or turtle you code in your game but nothing. Just nodes with wich I couldn't do anything while it looked like something essential. I replayed and searched your entire game lesson here in case I foolishly missed anything but no.

Fortunately, I am not a complete beginner and I found the documentation (link at the top). Now I understand node and the scary inability to grasp the editor disappeared. I almost gave up on using Godot because of that experience but now I am finally interested and curious.

As a conclusion, I think you should guide the beginner to at least have a sprite to code with, like the ones you use in practice, for example with a link to the documentation's example tutorial, and also warn to learn Godot's key concepts.
I know this game is about learning GDScript, not Godot, but your nice appealing little game floating around on this site may be the entrance door to Godot for a lot of curious people, and currently, because of the raised issue, may accidentally lead to negative publicity

My two cents