I could imagine this being in a Zero Escape-type game; kudos for really making a serious atmosphere for your game. To speed up the game a bit, I think there should be a way to forfeit your slots time or speed up the roulette (if there's a way to do this, I wasn't able to find it). I think a tooltip explaining what each colored card does would also be helpful, since relying on picking specific colors in a dark room is not super accessible. Simple graphics for each card could achieve the same effect. Overall, this is very promising! I look forward to seeing what the complete vision will look like.