Hi.
It's actually a good slasher. I don't like slashers because no explanations and motivations are being offered. Just creatures attacking in some way. And in your case, they are body invaders or something. But anywho I did enjoy the read although had to skim through some of the bloody action.
I think there's a bit of disbalance - it started talky and then you go straight action, gory and all kind of stuff.
Also, I think you could cut the talk with the third person, I don't see how it related with what happens later.
It meets the criteria.

I'll not mention the obvious error.  The rest of the story was pretty decent.  Good atmosphere and scenes.  Meets the criteria for me.  I liked the ending too.

Enjoyed it for the most part. Liked the title and the corn-husk mutations. To me that was original. But the slug-like creatures seemed like overkill and by the book "we need a slime creature." The circular/power saw was cool even if it broke the rules (didn't see the criteria beforehand) and am glad it wasn't a chainsaw. That would be too cliche again. Kind of had a Lovecraft feel to it too which was appreciated.