I need a game engine that's easy to learn in an hour or so, like Scratch but with widescreen support and no file size limit.

It's hard to learn a game engine within an hour, but I recommend Godot.

In one hour? i dont know if their is one....but some of the easiest i hard of are: Stencyl and BuildBox

pygame

pls don’t kill me

Python is super easy, so an engine that uses python (like pygame) or that is based on python (like godot) would be easy to learn

GDevelop5 is pretty easy

Construct 2 or 3 is perfect for scratch like programming! 

You could try bitsy.

If you want to stick to simpler stuff, skip the GUI part and go with text-only

GDevelop is good for no coding game engine

I use Construct 3 

Pygame and pyhton = 2 hours an your ready to create a game

Unity

But is hard

I'd say there's practically no game engine you can learn in an hour. However I'd recommend checking out Godot or Pygame. Pygame uses Python and Godot uses GDScript which is based on Python. So instead of trying to cram for this jam, try learning one of the suggestions in this thread for one or two weeks and join the next available Mini Jam then.