Cool idea, but I feel like making me press D at the beginning made it so I though I would use it later to unlock more. Also, you can keep shooting in midair to fly.
Hey, thanks for playing! that's a good point, I'll have to keep in mind the unlock part. I actually wanted it so you could fly in midair. Making it that way made it so all the levels were very easy. Since this was for a game jam, I would rather the game be too easy and everyone complete it than be too hard and people give up. Thanks so much for the comment and advice, I really appreciate it!