Does your game have to be "full"?
I guess your game has to be complete enough to be counted as a game. I expect the judges won't make allowances for a game billed as unfinished. Otherwise, a load of half-finished projects would be submitted in the hope that the judges will see the potential.
I'd recommend you look at your game and decide for yourself if it plays like a complete game. It sounds like it's a little short, but that's not necessarily a problem, since it has a track editor. Having only two weapons is also not such a bad thing, as long as both weapons add to the gameplay, and aren't superfluous.
So, in summary, as long as your game's good, playable, and doesn't crash when it tries to load the fourth, nonexistant track, I don't think you have a problem. Think quality over quantity. Is there anything simple you could add before you submit? you've got a few days. How about another couple of tracks? Or a time attack mode? Or even just one more weapon?
Good luck with it, anyway.