Hi Tim,
Nice to have newcomers in the jam. The core of all of this is to have a little bit of fun.
If you struggle at all, the forum is here, and either myself or one of the Adventuron jam regulars will be very happy to help you out.
Do allow a little bit of time at the end for playtesting, and if it's your first time coding in a while, try to keep it a manageable size, you can always expand it later if you hit your stride.
Good luck!
Chris