The crystal works like an Inn.
I really don't see what's so special about it.
Do you go back to the Inn after each fight in another RPG?
It works the same.
As for the rest, it's just part of the gameplay. Each item you collect has its effect instantly.
It's a different gameplay than the usual stuff. You don't collect items but when you touch them, you use their effect.
The cherry for instance will cure venom if you touch it.
The apple will give HP and revive dead characters if you touch it.
And so on.
