Happy Riches is a 5-reel, 30-payline slot, compatible with desktop and mobile devices, and accepting bets in the range 0.30-£75 per spin.
The symbols you will land on the reels are represented by Royals on the low end, as well as better-paying koi fish, oranges, waving cat, lanterns, etc. The golden dragon is the wild that replaces all the other symbols except for the scatter. The free spins symbol is the scatter, and as you have assumed, it triggers the free spins round. The presence of double symbols is definitely beneficial to your payout and the trigger of the free spins.
Land 4 scatters to trigger the free spins feature. Keep in mind the double symbols feature as in the best-case scenario, you will end up with 8 scatters ad 30 free spins. Wilds that appear in view become stacked. Scatters appear during the free spins round, so a re-trigger is possible.
From the look of it, Happy Riches is a no-frills slot, but given the fact that it is a remake of the widely popular Flowers, we expect it to enjoy a great mass appeal. The slot is still in the works, but we will update this review when we have more information about the release date and in-game features.