This is my first post lol, also I'm not a professional pls give me constructive criticism, anyways

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Day 1: "Warning, facility shutdown", "I repeat, facility shutdown" the sirens blared out. I quickly ran inside and barricaded the door, looked for rations and prepared to be shut in for a while before authorities arrive. While looking for food I found a pistol, I checked the magazine and found out it was loaded, "At least it's better than nothing" I muttered. As I sat down and rationed out the food I had I heard multiple thuds coming from the door, in a high, nasally voice something said "Let us in, I know you want to" in a sort of teasing tone but I didn't listen and continued with my business but the voice wouldn't stop, "let us in" "let us in" it said, the voice getting more and more distorted as it continued. After that I slept for the night with it's voice echoing in my head.

Day 2: After waking up the voice has disappeared, though I can see visible stresses start to form on the barricade. I search the room for stuff I've missed and find some food, enough to last me one more day. I'm still fine though I don't know how long this will last, I look at the clock and count the seconds until the next hour. At around 9:30 the voice and banging started again though the voice seemed more agitated this time, "let us in!" "let us in!" each time hitting the door, stronger and stronger each time. I decided to stay up and keep guard fearing that the barricade would break and they would get in but at around 1 a.m. it stopped.

Day 3: I woke up to the barricade almost destroyed and multiple voices all yelling "let us in! Let us in!" all in unison. Disturbed and concerned about this I grabbed the pistol and prepared for the barricade to finally break.

Thud

The barricade finally fell releasing the mutants into the office I've been living in for the past 2 days. When the first one of those "things" entered it felt as if time slowed, my heart was racing, sweat dripping down my face, I aimed the gun to the creatures and pressed the trigger.

BANG!

At that moment time went to normal, I was shooting down the abominations left and right, I have never felt an adrenaline rush like this before. After a while the room and my pistol's magazine were empty, I checked the hallways to see if it was clear, and to my utter fear I saw tens of them in the halls alone. I searched some cabinets outside and my "home" for another pistol or magazine, to my luck I found one of both in the janitor's closet, "odd, why he have this" I thought but I quickly brushed it off as I needed to survive. I loaded the pistol, now I have 2. I ran outside killing more of them off going to the surveillance room to check the cameras, when I checked the cameras I saw whole troops of them walking in the hall and in the testing area the egg where these things would emerge from. Seeing this made my heart sink so I hatched a plan, to avoid anything at all costs, my top priority was to get out but I felt tired so I blocked the door. Good night.

(give me your criticisms in the comments, thx)