Great game. And perhaps you weren't infected when you were safely at home, but a) you are a nutter with previous convictions b) you are invariably covered in zombie blood and organs after only a couple of miles, so you're probably infected by the end of the game. And if the ZOMBIE APOCALYPSE had happened and I was in the army, I don't think I'd be terribly rational or worry very much about who I shot.
The game is heavily influenced by old-school twitch platformers, most notably Jet Set Willy. Which was enormously frustrating. But add infinite lives, a sense of humour, and a soundtrack which complements the game rather than making you want to turn your volume down, and you have one of the best games I've played on Kong. Well played!