The editing when the main character punches (stabs?) the kid off the swing is something to behold, and I didn't even see the cut the first time I watched it.
You got the foundations of the genre right, but if this really were a Wrong Place/Wrong Time film, we should have been following the witness to the crime and not the murderer himself.
I actually thought for a second that the witness was the person who delivers the package to the killer later on in the film. Now that's wrong place/wrong time.
I don't know how I feel being asked to accept a bad guy as my protagonist. It's important for the audience to somewhat like/identify with your main characters.
Not really understanding the character's motivations in the beginning lead to me finding the ending with Mr. Rump very bizarre, but it looks like you guys had fun with it so I'll give it a pass for now.
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