all very good ideas, but
this flash is kinda all over the place if you ask me.
the concept and ideals are very unique, very extraordinary. Putting educatoinal value and entertainment value together in one flash is unbelieveably hard thing to do. Unfortunately, your flash wasn't successful at putting those 2 things together.
It was a very good try, trying tackle an exceptionally hard idea, but the execution was a one big miserable failure.
1st game: Three Lines of Defence
luckily, i was able to remember what i've learned in biology last year. but it's ok. the questions and stuff are totally fine. what the real problem is the shooting part. i've noticed that slight hit on the pathogens won't even affect them. after i've managed to kill a pathogen, it takes around 2 seconds to completely vanish from the screen. When i'm in the of Pathogen, even when it's dying, it still kills me. Three types of bullet was a clever idea, but since killing the pathogen is almost impossible, it has become a huge frustration, rather than adding interest.
Drag and Drop:
timed quiz is fine. but to make it more educational, you must allow the player to see which was wrong and why they are wrong. otherwise, the quiz is completely useless. Rather than using the stop watch as the counter, use the digital timer-ish counter. It notifies how much time does the player have much clearly and much quickly.
Game 3: the black plague.
Well, this game was an absolute disappointment. i would call it a "dumb pac-man".
During the pac-man gameplay, when you are heading up, and if you hold on to left button, whenever there's an opening to the left, the pac-man automatically moves left.
This game however, is completely differnet. When ever my character moves up, and when i push right button to make it move right whenever it meets an opening to the right, it never does anything i expect it to do. basically it hits the wall and stands there like a lifeless dummy. Also, the guard, (or the plagued ppl) are too fast after turning around a corner. I guess timing is essential here, but this game is seems almost impossible. try to make the speed of the guard equal to mine. otherwise it'll be gameover like over 5000 times.
This game need a horrid amount of improvement.
First of all, know which crowd you are aiming for. Certainly this is too hard for children, and sometimes, it's ridiculous for an adult to play (rarely). so my suggestion is this: try to set a difficulty specifically for each group. (children, middle-high, university, etc.)
You've tackled something that's very hard - i mean very hard - to accomplish. good try tho, but it need a better execution, and a clearer idea of which group is this game targeted for.