Im thinking maybe you could have the spider bite the guy early in the story. Then you could have the girl deal with the spider and looking for the medicine for her husband in this stormy weather.

Also you could have some backstory going - he is a vegetarian and she is not for example - just a suggestion - to spice things up a bit.

I do think it needs more so that the dialog doesnt sound matter-of-factly and characters have more depth to it. Said that, I still was interested to see what happened to her after his death. Too bad it ended too soon after that.

SPOILERS

Well written and entertaining, this could be a successful, very scary film.  The dialogue is funny and fast moving, contrasting the couple's bleak situation nicely.  

The clear image of Leo's first wound gives the story a jolt, right when needed, and Heidi's combined manic / heroic attempts to save him and herself are exciting and, I think, unexpected.

This could be an excellent film, creepy, frightening and likely to linger in the mind.

This is a consider for me for sure.

The writing was good, made the story just flow along and despite the only thing really happening is Leo getting bit by a spider, it was an interesting story. I like the situation you placed Heidi in, dark room, no way of communicating to the outside world to save her husband or boyfriend (some are calling him husband in their reviews and you also have Heidi say it was their anniversary, but she also says she was his girlfriend, so not sure which) and there's a spider lurking around intent on killing them, so screwed.

Good job on this.

I liked it, but you could definitely have done more to amp up the horror.

Maybe, like others have said, make the spider supernatural. Maybe couple that with making him a full-on tarantula. I think the visual would be quite strong. If Jaws had been a piranha, would the film (or its villain) be as iconic? What if Cujo were a Chihuahua? What if Christine were a Hot Wheels car? See where I'm getting?

In addition to a supernatural spider, make Leo act weird/scary, have him speak in weird tongues and demonic voices. Or just kill him off early. Any of these would ramp up the tension.

In one of your action lines, "it's" should be "its."

Other than that, not a whole lot wrong.

Consider. A-

Just saw this news item. This could've been your spider:

Man captures video of enormous spider carrying away mouse in home

Quoted Text COPPABELLA, Australia -- Jason Womal said he was getting ready to go to work when his neighbor asked him, "You want to see something cool?" The [...] man enthusiastically said yes and ended up recording video of an enormous huntsman spider carrying away an even bigger mouse in the house next door.

I'm kicking huntsman out of my place on a weekly basis, they generally like to hang out in the shower which always makes for a fun surprise.

Gotta love Australia!

Notes:
Not sure MEANWHILE is a proper slug time element.  Too bad because your first couple of paragraphs were pretty good.  Fix this.  Another little issue (not that it really stopped me – except to write it here) that the Radio Meteorologist should be at least mentioned in the description previous.  Like what you did with the Newscaster on page 4.  It’s obvious what’s going on, but make sure you find out what the actual way to set that up.  I would think a parenthetical and just Meteorologist on the dialogue would work.  Moving on…  

They might be better off sleeping in the car.  This is a great line, but I would have had one of the characters speaking it.  It really doesn’t read as good in the description.

He bounces his eyebrows provocatively.  You had this on page 4 and 6!  No no!

And that’s it.  Yep.  I like it.  So far, it’s written the best – to me.  Not really a comedy horror, and the horror is mild.  Doesn’t matter.  I wasn’t looking for buckets of blood to win the challenge for me.  It’s well written, dialogue is good, not many mistakes and ends good.  Sure, I saw the end coming a mile away, but it works.  Good job!

Met Challenge?: Yes
Horror: Mild, but yes.
Overall: Highly Recommend