I thought this was fairly nice, if it was a bit too simple. I was thinking at first that you could only die if you touch the spikes. I mean, they were themselves labeled "death". It turned out to be more difficult as bumping into the sides of the mountain hurt you too. It would probably be too easy if not for that. It seemed like you were really lacking music.
The sound effects it did have were decent. It was interesting to see how far you would go with the powerups. I pretty much ignored all of them that were not directly in my way. The death spikes make it look like the cave had teeth. It's good for itself.