This is just a black screen with a loud lawn mower sound for me :/

Fun, but with a few problems, most of which have been covered by other commenters. To those I would add that the play area is a bit of a strange shape - I would maybe not have stuck to the movie so religiously on that, because if you get cornered with your lawnmower stalled you do not have a lot of options, and your health goes down very rapidly. Maybe a non-lethal melee attack or something to keep them at bay would be another way to solve that issue.

Anyway, with a few tweaks and a bit more juice I think this could be quite an addictive game.

Fun idea. I liked the use of the character's face and background color for in game visual cues (stalling or health), reminded me of the Doom guy or Wolfenstein. I wish the camera was zoomed out just a bit further as it's kind of hard to see what you're doing at times. Good job, it certainly reminds me of the scene from the movie!

It's already been said but needs more blood :D  The stalling mower adds a good degree of challenge. You could add to this further by allowing the player to have control over restarting it, through some kind of minigame (button mashing?). I did find it hard to see where I was going when moving down the screen though as the character seemed to get lost behind the UI but some adjustments to how the camera tracks you could fix that. Well done! 

Only managed to get to 17... a fun/neat little game! :) Never seen the movie, but after watching the clip I think you've re-created it pretty well. As the other comment mentions, a bit more blood splatter would be neat. I do like the blood spray effect when a zombie walks into the mower though.

Great job :)