I thought it's going to be another flappy bird clone. Glad I was proven wrong.
Love how the game looks. The cutscene is really good. The voice overs and the story really help enhance the boss battle experience. The mechanic is really fun. The music and sound effects are good.
Allowing those who faced the boss to face him again without having to go past 16 pipes again is a really good decision.
Maybe make a medal in game over screen for the player who beat the game? That would really add to the sense of accomplishment.
I'm sure some people are going to miss the credit. People usually don't press play again after beating a game.
Overall, great game.