Not much
I think the weakest part about this was that it had no sound. I just wish there could have been some more effects to go along with the action. I did think you used a pretty interesting premise as there has been controversy over Shakespeare's authority. Then again, I have heard that's just conspiracy theories. I wish I could have recognized more of the icons he was fighting. I've always prided myself on knowing a lot about history.
Won't ruin the secret medal for everyone else, because I really shouldn't. It was basically just you clicking the same button over and over. When it got to Marlowe, it did get more complicated. I just wish there could have been some more detail into the background and again, music would make it more playable. At least I got both medals!