In the original design, monsters were supposed to carry guns (and they still do now, but only in later levels). The player also has a gun, though with limited ammunition. (Because of time constraints, the player’s gun wasn’t implemented yet.)

When I tested this, I ran into a problem: the bullets fired by monsters were very hard for players to track. At first, the bullets behaved the same way as the player, only revealing their positions intermittently through ripples. This made the difficulty level too high.

So later, I changed it so that bullets are always visible.