Like someone else said, the spikes do not collide in the way they're supposed to. It it's too complicated to make a triangle collision box, maybe you should make them red boxes with evil faces instead? :D
Also, it would be more comfortable to have a 1 or 2 seconds delay before retrying, with a message like "Restarting..." or something!
Other than that, it's a nice work, congrats and good luck for the future updates.