A thought I've had for a few days is this:
Maybe you guys could revamp the bubbles a little, how about adding some colour.?
My idea is this: As per the timer runs, it alters colour depending on how much time is left on it.
25-49% green bubble
50-74% amber bubble
75-100% red bubble
A purchased bubble, grey, or black which reverts to the above system as the timer dictates.
Reasons? It'd add some variety to the game, & for those who'd like to know when a foe might pop, they'd have a slightly more accurate idea.
Either that or just throw an external timer on the darn things if a splash of paint is too hard.
Any man who must say, 'I am the king' is no true king