Press O to open the panel. The codes are buttons. You do not have to enter them. Just press them :)
Viewing post in You Are NOT In The Matrix jam comments
(Update that I got to play it, thanks to your hint!) I love the graphics. I'm terrible at games, so having a cheat menu is great.
My only comment is, the enemies are placed too close to the start of the level, so sometimes I had to restart a couple of times before I can see what's happening.
But the game's concept is cool. It was fun trying out the different codes. I can see it having more random effects (like everythingburns, or 100enemies) just to mess with the player. :D