Well shoot, I spent almost half an hour trying to make that first bounce jump. No idea what I was doing wrong. I liked the aesthetics of the Portal-style game, and I'm impressed that you got actual character animations in there along with voice acting, but alas the gameplay experience was hard to enjoy. The sensitivity on the character's aiming, along with the odd, jerky movements almost made me motion sick (which rarely happens for me in video games). It felt like we had at least 2x gravity, which made it extra difficult to make the jump. Saddest of all, I never got to find out what the gun did. Lastly, I really didn't get much of a horror vibe. Maybe it comes along later, but it invoked more frustration than fear, but again I suspect that this game has more psychological horror.
It's still an impressive effort for under 7 days of development. If you get a chance to iron out some of those issues it might be a really fun experience. Keep it up!