Pretty good game, very creative and original. It just needs a lot more polish.
I like the idea of shooting the monster to reveal itself, but I don't like the idea of it coming to life after time runs out. Instead I would have the game just kill you instantly and punish you someway.
The weakest part of the game is definitely the audio and the clarity of the gameplay. I had to put my audio at FULL BLAST to hear the tutorial, and some of the sound effects felt weak.
The tutorial itself didn't make a whole lot of sense. It says to shoot the out of place object, which isn't that hard to understand, but trying to figure out the out of place object felt like it didn't make a whole lot of sense because at times some things felt really out of proportion. I was actually playing thinking to myself, "Damn! That is a huge bathtub and toilet!" I like how you have to determine the odd one out, like what you did in the 1st level. I want to see more of that, and maybe put objects in places that don't make a whole lot of sense (maybe a toilet in the living room)
On the plus side, this is a very original idea and I would love to see you flesh it out and what more you can do.