(Continuing from IER1's review...I think)
Good news: I found one of my flash players was able to run this with practically no lag at all! Now I can actually give a more thorough review aside from lag:
First of all, I adore the music choice here. Everything from the creepy undertones of the menu music to the country boss battle of stage 13.
Secondly, art is even more amazing, obviously...
Third and foremost, (and this is probably just a me thing) but I this game is incredibly captivating and quite addicting. Just the feeling of getting those upgrades and fighting against the immune system is so satisfying. I understand a lot of people probably find the gameplay repeative, and to be fair it can be a bit daunting after campaign mode. But I really just think it's a unique, investing skill concept.
I also think it actually makes sense the game gets harder over time; the whole point of the game is to "evolve" your character, and the more you evolve, the more enviornmental pressure there is to keep going. I wonder if it's possible to get to 100% at one point...
Regardless, I still think IER is an intriguing experience if you're both a fan of microbiology and video games. While it does have it's flaws, it'll hopefully keep you captivated enough for a long, long while.
(Side note: it's my personal head canon this germ is a mutation of multiple germs over the decades. It has the white blood cell killing abilities of HIV, the resistance to antibiotics like MRSA, and the invasive red blood cell infections of malaria.)
IMPORTANT THING TO NOTE: After stage 26, weird darker..."white" blood cells begin to spawn, and you can't kill them. I imagine this is just a glitch due to the fact this game is literally 13 years old, but it still gets a bit frustrating.