Love this.
The concept of trying to weed monsters out of a costume party is fantastic, and I found that even after I was losing and everyone started shuffling out the door, I was still having lots of fun just dashing around and knocking people over. I feel like a sign of a good design is when I'm having fun with your game outside the main objective as well.
Great work. Look into anti-alias settings for those tile jitters, fix the game pausing, and you will have a certified banger.
-Ian G