Stay Alive:

Added Post Processing Effect
Remade the Slum Grounds
Moved the Pistol to the start
Removed Poles
Changed the Lighting
Added more models
Balanced out the enemies to not waste more time
Moved sniper secret due to collision issue
Fixed some issues

Contamination:

In general:

Changed the Lighting in Level 1-8
Added Reptiloids and Adult Arachnoids
Balanced enemy fights
Fixed Bugs and issues
Added 4 Secrets
Moved the Painkiller music form Level 4-5 to Level 7
Increased player speed in most areas
Removed unnecessary cutscenes

Level 1:
Replaced the health secret with C4

Level 4:
Moved the AR to the start
Remade the Terrain
Added a right side temple to collect some stuff

Level 5:
Added fire to pedestals

Level 9:
Replaced the armor secret with a cannon
Added more models to reflect level 10
Added more laser ammo

Level 10:
Added more models to reflect level 9