Thanks for the feedback :)
I learned how to use TrenchBroom and Qodot (How the map was made) just when the jam started and the team set on making a shooter.
I ran out of time and didn't manage to fix that bug. ( About 200 to 400 enemies are spawned in invisible and that bogs down the game, and I can't figure out why exaclty that happens). But you were on the right track, there is a total of 11 letters and 2 guns you can find.
Maybe in the future I will try to make a full game out of this.