Really cool game, super-polished ! I had a great time playing it, it's quite addictive :) ! The music you chose fits well the rhythm of the game, the UI is very clean with a quick presentation/memo of the controls and nice animations.
You should definitely continue to work on it :) A few ideas/issues :
- a scoring system would be a great addition,
- some enemies overlap each other,
- some enemies (the arrows) got a little out of the borders, it would feel better if they stayed inside as all the rest is so clean ! :)
Good job !