This mod provides several changes to gameplay as following:-

1) BulletTime....yes, but it is not the same like in BulletTime mod. When you turn on bullettime, the gravity goes on its half, the gravity gun grows stronger, timescale goes on its 1/3 and the damage dealed to NPC's by headshots grows 2x.
2) Weapon sounds - weapon sounds changed for 357 Python, Pulse Rifle (AR2), Grenade ticking, Pistol, Shotgun and SMG.
3) Nearmiss sounds - added 5 new nearmiss sounds.
4) Weapon damage increased for almost every weapon.
5) Weapon magazine capacity increased for few weapons and maximum held magazine capacity increased as well.
6) Horsepower for buggy and airboat increased a lot (adding lot of fun to gameplay)
7) Canceled the Valve startup video -> faster loading.