Hey Mythric,
Project is right, the cheats are definitely made with a gamepad, and I might've made the execution time a bit too quick for many people I'll try and slow down the speed needed to pull it off.
The cheats dont translate very well when playing with Keyboard and Mouse so I added a quicker way to activate cheats temporarily until I can think of something better for the PC:
Mouse and Keyboard Cheats
Just press all three keys at the same time:
Invulnerability: I N L
Big Bullets: B Y G
Big Head Mode: B I G
Max Resources: R S C
Max Hearts: H R T
Max Ammo: G U N
Herd Up: H U P
Herd Down: H D M
Max Gas: G A S
All Survivors: S U V
All Shards: O R B
Hope this helps,
Rafi