Well there is only turns limit in the full version of the game. But this limit is presented not in all missions, there just some of them, where this limit is used. As for gold/silver/bronze, this is the rating that you get according to the amount of turns you made during the mission. In the demo version if you did'nt met the bronze level, you lose, but in the full version such feature isn't implemented.
Thank you for your question.
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