This idea has been done before, yet with much better gameplay. There doesn't seem to be a timer to let me know when the next level of bubbles is going to drop, and I wouldn't mind an indicator of some sort to let me know what the color of my next bubble will be. Also, hitting "Next" auto-shoots my first bubble. Doesn't hinder too much, but kind of a pain.
Dsrtrosy, try going neither. I often pit elements against creatures that are neither weak or strong vs. them. you're not getting the bonus, but you're not getting smashed either.
A fun game, but I have a small beef with it. When I turn off all symptoms, it's a harmless virus/bacteria/parasite... Why are entire countries shutting down because of something completely harmless?
I started playing for the badge, got it way early, but kept on playing. Everyone complaining it's too easy: Ages 4+ states it's for little kids. It's an adorable game for the little ones!
 "Neollect"){kind=icon}
 "Destroy Everything (with everything)"){kind=icon}
 "Hidden Parrots"){kind=icon}
 "Pirate Bubble War"){kind=icon}
 "Protector IV"){kind=icon}
 "Pandemic 2"){kind=icon}
 "Sling Junior"){kind=icon}