Perk changes

• Cheat Death - reduced the cooldown to 75 seconds (was 90)
• Void Walker - increased the number of allowed deaths to 2 (was 1)

Chapter 3

• wolves now run slightly slower
• amethyst walls move slower on normal and hard difficulties (speed is unchanged on easy)

Chapter 5

• big robots now move a bit slower but attack slightly faster
• lightning strikes remain on the ground for a shorter period of time

Chapter 8

• timed gates now stay open about 10% longer
• ice walls move slower on normal and hard difficulties (speed is unchanged on easy)