You can't turn it off as it is how you can get silver coins. If you don't want to collect outfits etc which use silver coins just never kill more than 3 zombies at once and you will never see the glitter.
I can't see how it's a problem, if anything it fits in and adds to the style of the game.
Well, he didn't actually say that. His post about the effects not making sense in a zombie killing game are what got me.
People shouldn't be making silly rules like this that limit what a game can be. It's like saying "If a game is about zombie killing, it MUST be like the RE series".
In other games the list goes on in terms of what doesn't make sense in whatever setting the game is in. Fortunately developers like Suda51 don't go by such rules. In an interview he clearly explained his intention with all the rainbows and sparkles, and how he wanted to make a different zombie game from all the other standard stuff.
What's unfortunate is I read that he's using feedback from Lollipop Chainsaw to create a new game.
Problem with this is it seems LC was generally disliked, most of the hate being from idiots and just opinions that are garbage. So chances are we're going to end up with something average.