I loved the atmosphere and the crazy abomination pixel art. It's the perfect blend of recognizable shapes and unsettling arrangements. Cool premise, too.
I found the gameplay to be a bit frustrating. I eventually figured out you can "hide" in the rooms, but the abomination never seemed to go away. I'm not sure how I could ever beat this unless I just get lucky. Once it finds you, it seems like a loss is inevitable as there's no apparent way to shake it. I think rooms with two exits into opposite halls would help with this a lot.
Also, I'm unsure what was happening with the audio. There was a loud clicking (the abomination?) that sped up as it got closer. It was a good idea to have an audio queue hint at how close it is, but it felt a bit too loud and sharp. Volume controls are pretty easy to implement once you've done it once and make a huge impact on the polish of a jam game. Try it out next time :)
Overall, super cool experience, even if I couldn't find more than one gem. Keep up the good work and congrats on making this in just a few short days!