This is really cool! Definitely bare bones as you said, but I can think of a few ways you could evolve it into a fun little puzzle game. You could have levels where you only get X clicks, and have to meet a minimum point requirement before your clicks run out. Difficulty of puzzle could be affected by score, number of clicks, spawn rate of bubbles, and proximity of the spawns.
I'd also recommend adding a little +score pop up that appears and disappears on top of each bubble after you pop it. It's difficult to know how many points you are earning otherwise, because keeping an eye on the score at the top while also watching the bubbles is tough.