I think this game has a good idea at its core, but there are some things that I think can be tuned better that can alleviate some unwarranted frustration - especially in a game jam context.
I think what was frustrating was mostly dodging the tomb stones; however, I would have been more accepting of it if I didn't have to collect every single pumpkin. I think there could have been a cool 'work towards' factor that would have made me want to replay the game over and over. Rather than making the player collect all pumpkins - they can collect as many possible during a run - and then replay to perfect their collection capabilities. Also, a scoring aspect would have been nice too.
Nice job overall!