In my opinion, the game is interesting, but it would become even more interesting if users had more opportunities to predict the outcome of price movements. This can only be done by increasing the game timeframe. Indeed, 15 and 30 seconds are too short and the luck factor plays almost 100% here. If the timeframes were at least 1 hour, 6 hours, 1 day or even 1 week long, then the result would be more predictable and analysts, and not just entertainment lovers, would start playing this game. The color scheme of the site is also fun, but sometimes it can be annoying to the eyes.
If you set the timeframe to over an hour, that's a lot of waiting and I guess it's not anymore viable to a casino because as much as possible they want to maximize their profit, so fast result would give that and they'll say no to longer results, unless the minimum bet is increase but I still doubt it will be more profitable for them compared to the current set up.