The more I play, the more gem rewards I get

I've played games like this before, I remember it was the English version. Back then, I felt like resources were scarce and mining speed was slow. The hidden quests were too difficult, so I gave up after playing only a few times. I thought it would be the same this time, but after playing for a few days, I found that resources aren't hard to come by. Although the mining speed is still super slow, I've been playing casually, and I've only completed two hidden quests. However, as I played the game, the time reward went from 500 to 1500. Seeing the time rewards increase over the past few days, I decided to play a bit more seriously. The time reward went from 2000 to 4100, then to 5100. I'm not sure if it's like this for every game, but at least for this game, the more you play seriously, the more you get, even if there are no more hidden quests.