I used Godot too. I think its quite easy compared with something like Unity.
Its too late for this jam but you might find it useful in others.
In the project settings
Display -> Window -> Set width and height to 64
Display -> Window -> Set test width and test height to a multiple of 64 e.g. 512
Display -> Stretch -> Set mode to viewport and aspect to keep.
Rendering -> 2D Tick use GPU Pixel Snap