Cool combo game! I think you did well with difficulty (to throw another opinion into the mix). I think it's very hard to judge in a game jam when you are condensing a full experience into a few minutes. I've had the same problem. I think in a game jam I tend to err on the slightly easier side just because you don't want to turn off potentially short attention spans. We have a lot of games to look at.
Good job, anyway! I like the combination of two games! Next time I would challenge you to add a twist to the snake portion and add some simple animations.