I have done this on gun survive mode and not tested in campaign...ok...here u go..
Open CE...
Open process and click at alien shooter exe..
[b]Budha[/b]
write the amount of ur health at the CE and click first scan..
Now u decrease ur life by been atacked by alien/creature
Now u write the amount of ur life left at the CE and click next scan..
Do this process until u get the correct adresss ur until u get adress beetween 2~5...
Now double click at all the adress...
Frozen the adresss and change the value to 1000 or any amount u like...Now u can enjaoy watch the game..because u cant die... i prefer u all to play speed hack..
[b]Unlimited score[/b]
Write amount of ur curent score at CE...if from begining the score=0
Now kill 1 allien and writhe score u get...and click next scan..
Repeat this until u get the adress...
After u get the dress u double click at hte adress...
now u change the value to 9999999 or any amount u want...