I like how it only punctures them instead of slicing when you don't hold the button down long enough, but you shouldn't have stopped there.
Right now it only calculates how far there is from the point of entry to the exit on the object you hit, when determining how long you have to hold the button to slice. It never slices through more than one object. It would've been cool if powering it all the way would either outright kill a zombie or slices through an additional one.
I noticed that many of you only got about ½-way through, here are some tips:
1 Shooting between head and hands kill the zombie instantly
2 It only takes around 0.4 secs to power the laser up, for killing a zombie, but it powers up for a little more than an additional second more.
3 Zombies have a hard time catching up with you uphill
4 Jumping is your friend, don't stand in front of them while charging if you're not sure you can fire and hit before they hit you.
The game is kinda easy when you get a hang of it.
I would've loved either a longer soundtrack or different ones, as it is it just gets repetitive.