So this game features you as a guy in a mountain full of zombies. Yes, you have a sword, but you only get one, so if you break it, you lose it, and you will probably die. You will probably die anyways, but that is another thing. There should also be treasure hidden somewhere.
The game is made only using HTML5 and Javascript. The soure code is all in the HTML file.
The mountains, the zombies and the sword are procedurally generated.
EDIT: Fixed a bug with win condition, it was a < that was supposed to be a >, the game is now winnable, and the treasure is slightly underground now, not floating high in the sky, that was another typo.
The movement is fun when you're going downhill and pick up speed.
The combat was not the same experience though, I'd see bullets wiz through me and then I'd die after the enemy breathed on my big toe. (This is on Firefox) and once the game seemed to restart when I had half health.
It was a fun experience overall but I would have played longer if not for the weirdness of the combat.
The game is actually pretty hard. More enemies, powerups and a bigger jump height would have been nice though.