The levels with the shotgun are annoying... the levels with the things that speed your "character" up and shoot it accross the screen are just pissing me off. It will either barely shoot you and do NOTHING, or will shoot you clear accross the screen ... which then gets you stuck between the already developing bubbles there. Lame. Remove the speed circles and this game would be fun.
Phage wars is MUCH better. The AI is too smart on the higher levels, they see you have 1/3 their number and just attack right off without going for greys. 2/5
I think the colours should have greater contrast to know which ones are one clicks, two, three, or four. Also, randomness of pyramids make the insane levels mostly luck based. Good game for the most part.