The concept here is really cool. the idea that you can continue to later levels, even tho you probably wont be able to finish them without getting further in early levels, is interesting and not something you see in level-based games very often. My only complaint with this feature is that it isn't really used brilliantly. If you go through the game treating the spikes as the end as the flag pole, its really just like any other game of its type. Maybe use your idea in some cooler ways? really like the concept you came up with tho, very creative