[cakebrewery]

You can probably do this with simple tools. It's all about the layers; If you observe closely, you can see all the objects in the frame have very simple movements.

The 3D effect is just an optical illusion coming from all these simple movements in 2D space.

Some creativity goes a long way!

[valine]

I disagree. Look at the airplane, it's clearly made in 3D software.

[cakebrewery]

Very possibly. But that would be easily reproducible with layers as well.

Look how there is no perspective change on the rising blocks and the shadow underneath. Blocks just move straight up and down and shadow just increases/decreases in size.

People movements are just tween animations.

[valine]

Its an orthographic rendering, that's why there are no perspective shifts.