OMG, these sound effects are so funny XD I love it! Since I skipped the instructions on my first playthrough, I just kept shooting people. The shooting was responsive and had pretty good effects upon hitting the enemy. Still, even if I didn't know about the xray mechanic, I still managed to reach the final wave. Even without moving or shooting on the final wave, I survived. Maybe it'd be better to up the ratio of bad to good guys?