in World of Warcraft, your level is determined by the experience of a player, not by the map he is walking on.
Thats not what they mean by "level" in this contest.


"Level" means a few different things.
Is the plane level?
Are you on the level?
etc

But when talking about game "level design"
that means not only a map,
but placement of characters and enemies,
items, traps, doors, keys, triggers, etc.
There are entire books on this subject.
People even have job titles: "Game Level Designer".

There has to be different things, like new enemies, or different arrangement of items on the map, for levels to be different.

When you play a "new level" thats gotta be something you go
"hey, this isnt the same as the level i just played, its new. its a new level"

I cant comment on your game but if the judges thought that, maybe you should change something to catch their attention.