It pretty much requires you to click like a maniac the whole time. I always prefer it when I can quickly transition to passive income. (There is a passive income option, but it would greatly slow down the game if you were to stop clicking and rely on it.) I quickly abandon games that force you to endlessly click. Some games reduce the wear-and-tear on your fingers and mouse by letting you press and hold, or hover, instead. But true idle games are the best.
I'll think about making passive income stronger and introducing it earlier. Also thanks for the idea with the press and hold, I use it myself while testing the game, but I thought it would be too easy for players. I'll definitely add a weakened version of the holding for the game.
Upd: added the ability to hold the crystal to get 5 clicks per second :D