First off I'd like to say I enjoy this game immensly. It is a very fun and easy to play game, but that doesn't mean I can't find something to upgrade here and there.

I. Guilds
A. A bank system, for players to deposit crowns and crystal energy they don't use for their fellow guildie's to use.
B. A guild hall upgrade system, guild leaders pay a certain amount of crowns/crystal energy and it opens up new areas of the hall, maybe unlocking Traveling Strangers that come and sell recipes, armor, weapons, etc.
C. A guild wall in the hall, for guild leader's and officers to write on for a lasting message to give to the rest of the hall in case they aren't online all the time. Also, if this wall is given, allow the guild leader to choose who gets to write on the walls.

II. Weapons/Armor
A. Enchantments, kind of like Unique Variants, but could be different too. Ideas like, increased chance of item/token dropping, or fun ideas like chance that you transform into the enemy you killed(this is general ideas, not to say I want to be a wolvar). You'd probably buy these chantments from a Stranger for Crystal Energy.

III. Mini-games
A. This is a work in process idea. I'm placing it here to plant the seed in your mind.
1. Tennis, players hit a ball of energy back and forth with their swords.
2. Target practice, players shoot their guns at moving targets.

IV. Clockwork
A. Secrets would be fun. I found one once where a switch was hidden in a rock that could only be reached with a gun.
1. Hidden rooms, like a rock hides a hole in the ground that you can jump down into that might be a nest of monsters or treasure.

V. Players
A. Mist tank expansion, like you spend x amount of crystal energy and for, let's say, a month your mist tank can hold x amount more of energy.

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I might add more to this, but again, this game is a lot of fun and has so much potential to be much more.