Hey!
The game was really nice, great work. The fact that you are 12 makes it even great. You had good music, visuals and it was fun to play. I love the fact that you took time to animate those circles, I love the wiggle, it really adds to the game feeling.
If you are looking for some feedback, here's mine (I know you are at the beginning of your journey so I'm not gonna be hard on you ^_^ Just point out some things):
I think you should choose more carefully your colors. Instead of going for straight blue, red, yellow, green, you can find a color palette on the internet with 10 colors or so and use it. And you can choose whatever you like. This way you ensure that the look of the game is not hard on the eyes.
Another thing (and last) would be to zoom out the camera a little bit, so that the player is able to see the enemies coming.
Other than that, you really did an amazing job and you should be proud of what you did. Continue to improve and I'm sure you will get there! Congrats!
I would love to have you playing mine too, if you don't mind of course! ^_^