There is a godot addon called 

Orchestrator

I don't know how good it works with 2d but it might be worth giving a try.

https://godotengine.org/asset-library/asset/3209

On the other hand, there are some 2d game engines that have visual scripting built in, such as:

• Construct (PAID) construct.net
• GDevelop (PAID) gdevelop.io
• Gamemaker (PAID) gamemaker.io
• Clickteam Fusion (PAID) clickteam.com/clickteam-fusion-2-5

There is also a free one:

• CTJS (FREE) ctjs.rocks
  

Fnaf: into the pit is a high scope game, meaning that you are likely to give up before getting close to finishing it.

I suggest you make a bunch of small game first (Yes, I know it sounds awful, but many people have quit game dev for trying to make some big games, stuff like Minecraft, FNAF: SB, Binding of Isaac, Stardew Valley, and even stuff like a 2d puzzle game with roaming characters and a bunch of content) so if you haven't already, I suggest you do so. Even stuff like a fnaf 1 remake works.