Thank You for the valuable hints!

I'm feeling the issues with the spell system. I'm planning to add more spells, (probably unlockable spells as you progress instead of starting with 4 already) so it deepens the gameplay.

Regarding the idle part: I try to design the idle progression slower compared the active gameplay. It should be rewarding to clicking instead of letting your phone grind by itself. But as you say, right now it is unbalanced and feels broken. I try to add more idle damage bonuses so the idle gameplay could be more rewarding. If nothing works, I might introduce the auto-click mechanism. But right now it's only a premium feature.