Learned a lot about pathfinding and world generation in the last days. Normally I do 48hour jams so I propably just wait until friday night and then start with a pretty well 5 day prepared setup.
Don't stress so much. Write clean code with a lot of comments so it can be debugged in the last 5 minutes (when you try to build and upload it).
AND BUILD IT NOW so you can big build problems you face right now.