The game is super cute! It's fun once you fully understand how the game works. As everyone else has commented, the game would benefit from a simple tutorial.
I especially like that the visuals all include only the allowed circles and pentagons, and that it somehow does not feel like the shapes were limited for this game.
The audio also matches the cute artstyle and make the game feel relatively polished for such a short development time. However I am a bit stuck on whether the music matches the gameplay, as the gameplay feels more intense than the music is. So the sound is both well picked and a bit off.
Good stuff!