Nice! A bubble shooter is certainly an excellent choice for this game jam, as it's primarily based around circles. You mastered the gameplay aspect of this game quite nicely - it plays, feels, and acts exactly how a bubble shooter should be.
However, this leads me to my next point and that is that the game doesn't have much of a creative twist, or a unique mechanic that differentiates it from other buble shooter type games. I was expecting more of a twist with the name "Not Another Bubble Shooter."
In terms of art, you did quite well - especially considering the time limitation! The game also fits the theme fits in an intuitive and logical way. Nice job integrating that.
It would also be cool to have some sound effects and music, which would make the experience even more engaging.
Great job, @theChief! This is a great submission that cleverly solves the theme and shape limitation in a fun way :D