What the Heck?
Terrible AI. You could have ducked almost the entire first level and not die. Kind of stupid that enemies can shoot behind a tank and not get damaged. Especially the tank that rolls bowling balls at you. So you can't stand up, jump over, or duck the bullets. That leaves you with a lot of options.
1 hit kill? What game allows you to die so easily. And why do enemies spawn out of nowhere?