A fun game with a good difficulty ramp-up. The controls are pretty tricky, but I think it's part of the challenge. Having easy controls would just mean the game takes longer to reach the point where you cannot keep up.
Not really sure about the feather-collecting-shooting mechanic though. You have to be facing the nightmares to shoot them, and at that point you might as well press forward to ram them. The feathers bouncing off of enemies and potentially hitting multiples is fun but too random to really use.