don't worry, as the jam is less of a competition and more of a fun little "can you get a functional game with a set limit of time". if last place is a valid fear, it won't affect the fact that YOU made a game within the time limit. the odds of last place overall are slim to almost none and even if you get that... there is no loss in getting last if anything, its only a learning experience.
in summary:
- the jam is only meant for fun.
- don't worry about getting last
- failure is only a learning experience.