I got 51% which I thought was quite good since I only have O level biology from 47 years ago.
Although not strictly a game I quite enjoyed answering the questions. More please.
I agree with Axyraandas. since most people are right handed using either the arrow keys or mouse with left hand is awkward. When flying? there is no way to see where you will land. also jumping does not get you above the bullets.
Once you put the knife in the slot you cannot see the symbols. I had to guess them. it was only by looking at the walkthrough that I discovered the knife had symbols.