I've seen a lot of people commenting Phage Wars 2 and saying its too hard, I myself think that it is waaaay too easy. The first game was definitely a lot harder.
Tips -
SEQUENCE YOUR GENES!!!
I'm sure a lot of people just run the experiments through and that's it, I'm sure that would make the game a lot harder (Hmm.. Maybe I'll try playing it through with no stat increases now, lol)
As you progress through the game you get Genes to bolster your viri's