It's a game you can play while zoning out

Slurp! Mindlessly doing quests and collecting gems is a prime example of clean economic activity, heh. With a benevolent heart, I ask, do you have any more brilliant personal methods for efficient gem acquisition? Your careful handling of Asteria's gems is truly heartwarming, hmm!

This game is easy enough to clear even the hidden parts.

It's an idle game. You clear stages, reincarnate, level up stats, and clear them again. It's a bit simple but playable. For diamonds, buy skins.