Great presentation, the vibe and atmosphere is undoubtedly here. I think you really grasped the idea for Buckshot Roulette like games - vibes vibes vibes. Though personally I think "dark underground club" is not the only answer, but you delivered it pretty well.
As a game player is genuinely looking for agencies which is absent here. Can I push the saw back when I win? Is there a way i can get out of this emptiness?
I played for 10 mins just to see if there is any other items I can make use of. If you are going for item strategies, maybe more items that player can meaningfully interact with would worthy designing.