Just one minor thing for the History section:First, I don't know if this is a big deal or not, but the Japanese ( Famicom) version of Contra has a decent backstory behind it that is considered "canon" to the series.
If I had to give one pointer, it may be to talk a little slower? It may be your artistic choice and if it is I rescind my point but there were some sections where I had a hard time understanding you. It may just be me though.
I like what you've done, sir. Good thing you gave this one a 10/10 or I would have to hunt you down. Good review. I enjoyed it.