I enjoyed the carnival setting and the music! One addition that would add some satisfaction is a little impact sound effect/particle effect when you shoot the dragons!

Like someone else mentioned, I also enjoyed the carnival vibe, it made me nostalgic and want to go to a fair again! Maybe you could add a limited number of bullets if you make different levels/rounds and dragons of different point value! 

The presentation is top tier! I wish there was m ore gameplay though, like different dragons giving more time but moving faster or humans that move across the screen and take time away if you shoot them. 

I liked the medieval fair/carnival vibe I got from the game :3