The Hold the Spin slot with a bonus is from Gamzix in social casino

Lately, I've been testing slots with interesting features in social casinos with a mythology theme. I recently came across Olympus of Luck: Hold the Spin from Gamzix and was pleasantly surprised by the graphics. However, I haven't fully figured out their signature bonus feature yet. Could you tell me how the bonus round with coin fixation is activated and how realistic it is to catch the jackpot? This title is currently at the top in the lobby with gamzix slots at american luck, so I would love to hear your impressions and practical advice before spinning a considerable amount of virtual coins there. What do you think about the volatility and bonuses of this machine?