Nice game. I like the core gameplay and game vibe.
Would like to understand how to pick challenges, or to plan a course. I see now from the comments below, that the terrain does affect the challenges. Making the player aware of this will enable them to plan better, as compared to simply following the compass, which is what I did. Some variety in the challenges and cards, etc. would also help.
Overall great game for the jam, with good potential for expansion. Well done!