Overall, I liked the film, but it had some quirks that I wish it hadn't. I'll get those out of the way first.
The other story aspect that bothered me is that there were a couple of characters in the film that served no purpose other than giving Mia someone else to kill.
I'll list some grocery items here and you let your imagination go: syringe, taser, axe, bleach. Yes, she killed someone with bleach. Now I have to go watch Heathers.
The effects were all practical and realistic.
* (9-13-15) So Vimeo's encoding apparently muddled the soundtrack on this one. Clean sound would likely push that score into the A/B range, and that will raise the score for this film. Give it a watch!