IDK, what is be chaos theme mean

so, what is let there be chaos mean

Destruction, bombs, chaos

a lot of bad things happening in the same time.

Bullet hells are chaotic because there are lots of bullets.

some zombie type game might be chaotic if lots of them come from every direction.

Basically, hard to know what is going on.

The definition of chaos is disorder and confusion

mean you make a game which is having a something like not tidy

Chaos is a state of extreme confusion I think 

I think to much hings to consider, I also dont get it