(Gameplay is below but here's my review and thoughts first :) )
This was really fun and terrifying experience! Reminded me so much of a game I played on my channel last year called "VANISH" where it was the same premise just minus the shotgun haha.
The atmosphere as well as the creatures was just pretty well done in my opinion. The only issues I had were the running, reloading, and the creatures health being a bit too high (at least using 6-7 bullets to put one creature down) because it's overwhelming to see two creatures coming at you at once and it takes 6-7 shotgun shells to put down one and you're in the middle of reloading and get killed.
But other than that I was definitely frightened by this game :D Really worth playing in my opinion and I recommend the game to anyone!