You totally got me.
Haha. I didn't expect that thing coming, my face was all close to the screen trying to figure out what was going to happen and BAM! I almost jumped out of my seat.... HAHAHA. Seriously, my heart's pumping blood fast now. XD
Great job. The graphics were good, not as well done as your other works. But you said this was one for every thirty days? If you did this in one day, kudos to you. I loved it. Sound was nice, too. You made me turn it up really high to hear the low humming, and then the monster was extremely loud. Nice trick. Made the scare so much the scarier. Overall: this rocks my socks.