In roulette, I often hit 'double bets', and then can't be sure whether I clicked properly or not. It feels like there's not enough visual feedback that the click was received. I know the bet amounts double, but they're in a pretty small font. I'm wondering whether changing the button to "doubling" for a fraction of a second would be useful.
+1 more confirmation on placing last bet and doubling buttons
Maybe just make the button go bright when it's clicked, and fade back to normal colour over the next second or so. That could perhaps be a default behaviour for all the buttons in all the games if it looks nice.