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I'm interested in a casino that has an internal system of achievements or progress. Like, you passed a level - you got free spins or a bonus. This adds interest, especially if you play regularly. I want to feel the dynamics, and not just deposits and spins endlessly.
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At Pin Up download, a system with levels is implemented — each step brings goodies. At first, I didn’t even notice, but then I realized: points are awarded for active play, and when the threshold is reached, free spins, no-deposit bonuses and other gifts are given. There is a player rating, and you can see how everyone is progressing. The transition between levels feels like an achievement — motivation to play not only for the sake of winning, but also for the sake of progress.