CoSMOS Gamehacking Tool

Trying to use Cosmos for the Nero The Sniper game - life and ammo/grenades etc. But when I open the game - cosmos only runs so far and then both the game and COSMOS freeze??? I then can't get out of either the game or COSMOS??????

Can't even get the Task Manager to open up??

Any pointers please - only using the beginner Cosmos - game is on Steam?

Thanks
Seahorse