This is a very simple mod. It adds a "new" mob, the Beta Creeper, which functions the same as Creepers did in 2009. Instead of approaching and bombing players, the Beta Creeper attacks like a normal mob. On death, it will explode. This explosion sound, as well as all the Creeper's damage and death sounds, are lifted straight from Beta Minecraft.
For playability, the Beta Creeper does have a slightly different texture so it can be distinguished. This is very subtle though- its eyes are faintly red tinted, and it is ever so slightly more saturated than the normal Creeper.
