Just a few minor things that aren't noted in-game that some people will find important:

-Escape pauses the game. This is how you can find your password.

-Number keys can also switch weapons. Numpad keys, not so much.

-*whistles innocently while looking at the control test screen as though it has some hidden secret*

-The BetterPixels font is public domain and can be found here: http://www.pentacom.jp/pentacom/bitfontmaker2/gallery/?id=102