"...with the tiniest of steps like we're penguins." I loved this line! The ending definitely surprised me. I think you did a great job of putting your own spin on the Resident Evil / The Thing inspiration. There were many well written parts and I wanted more by the end. I think that's a really good thing! Clara rocks, even if a little scary!
As someone who's interested in Interactive Fiction, I also liked how you stuck to the major points and didn't make any dialogue or description too long. It felt comfortable to play and more like watching a movie.
As for feedback, I only had trouble with one thing which was making sense of the navigation mechanic. It took me a few minutes to understand where I was going. After I started looking at the map, I realized my options were related to where I was. I know it must seem obvious to the developer but I really was lost!
Maybe highlighting the entire section we're currently on with a different color would help instead of the flashing icon. Also, giving a slightly different tint to the protagonist's portrait could emphasize we're Erika??
Your neocities mentions you're Korean! I'm playing this from Seoul!
Also, I'm working on Interactive Fiction content myself, if you're interested, I could keep you in the loop once I'm further along. Great game! :)