Well... the worth of a level/game is pretty much determined apon its quality. I mean, not all games are created equal. So, to be honest, you are the best one to know how much your game/level is worth. If it is too high for the contract, either cut your losses and leave the table, or step the price down.

I have seen prices anywhere from 50$, for the basics of basics, to several hundred dollars, for a mid to high quality level.

I dont know how much screenshots will help, but perhaps others could gauge its worth based on its overall quality???

So... that is my advice. Vague? Yes, but without seeing it, I couldnt really point to a number. Even with seeing it, I may not be able to...

If you want to know what I would do... I would lisence the whole game over. That would be the most money, and frankly, publishing a game yourself can be VERY hit and miss, and dosent guarantee any profits. So, sinse this sounds more reliable, go ahead and lisence the game over .

Anyways, good luck with the contract.
Raddadddy