The sprites look good, although it would be even better if they were animated, The obstacles are a little unforgiving sending you back to the beginning on a single touch with no warning, two or three extra lives would have helped out or at least a slight pause so the player could see how they died. it could also use a few sound effects.
Reading that this is your first game jam, I hope you had fun and I'm sure you learned a lot from it, next time I'm sure you'll make a good one!