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.

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

-Control + M disables music.

-Control + I gives you extra HP at any time. Badges are disabled for the rest of the stage if you do this.

-The boomerang can retrieve health pickups from a distance. Just thought you'd wanna know.

-DO NOT REDISTRIBUTE WITHOUT PERMISSION FROM HAPPY FROG GAMES, LLC, OR WHOMEVER THE RIGHTS HOLDERS OF THE GAME (Xenogunner) MAY BE AT THE POINT IN TIME YOU WISH TO DO SO. DO NOT REVERSE-ENGINEER THE GAME WITHOUT PERMISSION FROM HAPPY FROG GAMES, LLC, OR WHOMEVER THE RIGHTS HOLDERS OF THE GAME (Xenogunner) MAY BE AT THE POINT IN TIME YOU WISH TO DO SO. BY RUNNING THE CURRENT VERSION OF THE GAME YOU AGREE TO THIS.