Nice little game, it kind of reminds me of an FPS trainer :D just quickly popping things with the mouse!
Things I would improve: why not introduce a bonus when bubbles overlap and then add that to a score? Or have a score system in general—that would be cool! I unfortunately stopped after about 3 minutes because I felt like the spawn speed wasn’t increasing. If the bubbles moved faster over time, the challenge would steadily ramp up and keep the player engaged longer.
Otherwise, a solid jam entry :) keep it up.