Played the full version:
The minimalist black and white visuals are good and the lack of music works well with it and adds to the tension. Although I thought it was a survival game, I still like how the Russian Roulette gameplay was handled (kind of a mix between Balatro and Buckshot Roulette). is score based and any wrong prediction reduces the multiplier, and also, every deck is randomised so that it's difficult to predict the next move. Also, I wondered why you couldn't get crown cards until I realised that would make your deck overpowered against spades.
If I had to improve anything, it'd be the ability to go to main menu during or after gameplay (mainly to check the tutorial), and add any indication that you have limited tries to reach the score requirements after the bullets are gone.