Hmmm.... difficult question. But in my point of view a "level" should be something you "build with your level editor as requested in the first stages.

I think that a leveleditor should be something where you can place tiles, 3D objects or whatever, shortly said, change the "level/map/environment" and in addition maybe some variables like strength of the enemys etc. otherwise a level could be done with only one variable, for example the maximum time you have to run from place A to place B.

But as you mentioned before, your intention is something like space invaders, where only the amount and strenght or kind of enemys change. Hmmmm.... in older games, this is definetely defined as a level.

I think it depends on the judges, but if you can't create simple "maps", how did you got the points for the leveleditor in stage 2 then? And if you have an editor, why don't you use it?

Greetings,
Dirk