Horrible.
1. Poor choice of music.
2. Poor Gameplay - Yes, it's just a platformer, but seriously? Can you make a double jump look more unatural then it should? It was like you actually stopped in mid jump, found an invisible plot of land, then jumped again. There was no flow at all.
3. There are many more excellent platformers that have come on newgrounds prior to this. This... lacks in all aspects.