Super fun little game, especially for being a "hyper-casual" game!
Love the idea of the bomb bubbles in combination with the changing colors of the "bad bubble." This simple combination of hazards quickly becomes very engaging and challenging! The "pop" sounds are super satisfying to hear, and the noise alone is enough of a reward to keep playing. I appreciate that you chose a few different pop noises as well, rather than always playing the same one.
A few nitpicks I have, though; The collider on the bubbles doesn't feel quite large enough. Sometimes it definitely felt like I clicked a bubble that did not pop. The color palette didn't feel defined enough. As the game went one, browns felt like they were mixing with tans, and it's not that they were even remotely hard to distinguish from each other, but when there is a brown and a tan on screen, and the borders are representing one of those colors, but aren't the exact same color, it becomes confusing. Lastly, that the time counts up to some undefined number before changing the border color, whereas I think it should count down from 3.
Overall, super fun little casual game, and very satisfying to play.