Good job! This is a simple game that is easy to jump into and is pretty fun. Good use of shapes for gameplay and UI and it does well sticking to the theme. I was able to make it through all 15 levels and have some feedback.
The replay button after loosing is great, but it is a little weird to go back 1 level as a result. It breaks the flow of the game a little bit having to retry a prior level to redo where you messed up.
Overall the UI experience is pretty smooth, but you can click the replay button multiple times while the animation to go back to the level is playing. Ultimately this doesn't ruin the gameplay experience, but is one of those bits of polish that can make games feel better.
Now for some feedback on the gameplay. It was a little disappointing how much I felt like I could cheese thing by spamming left click. Some levels could be completed by this alone. Most of the other levels would get me down to two or three circles left by the time the pentagon made a full revolution. I think a simple solution that could help with this would be to include circles that are already on the pentagon for some levels and reduce the number of circles you need to shoot. This way you can't just start levels by spamming left click until the pentagon finishes a full revolution. Even just adding one or two circles can force the player to think a bit more before firing off their first circle.
Again, great job. I had fun playing!