It’s been a while but I’m here to bring you a prototype game walkthrough and a Javascript tutorial focused for GDevelop (presently uploading, may have posted this a bit prematurely 
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Trial By Fire game walkthrough: Trial By Fire - Game Walkthrough | GDevelop 5 tutorial - YouTube
Trial By Fire game: Trial By Fire by jclevin
If you’re unfamiliar with Javascript or JSON you may find this tutorial helpful to understand and pick through the game walkthrough. The idea is that the video makes you familiar enough with javascript so that you’re not afraid of downloading the game files and playing around to explore how it works.
Javascript tutorial: Javascript Tutorial For GDevelop - YouTube