You do not have to allow for route/location selection, but as SilverWarior states, this limits your ability to take the bonus for allowing players to revisit locations within the same playthrough.
That said, design is up to you. If you feel that your game should have level/route/location selection then by all means add it if you are able, but if you are sure that it shouldn't have it then stick with your guns. Mind you, if you do have time for a story driven game in only 4 weeks plus a weekend then you and I should be working on a project together.
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