The magic system from that game would tie into this game pretty nicely....

Subscription for inexhaustible mist energy? I realize this might be hard to implement considering somebody might subscribe for a month, burn 100000 energy on crafting, and then cancel subscription.... but it would be nice to feel like I wasn't in a game that had the added stress of spending too much money on it hanging over my head. For the record I've been fine about the amount I've spent so far, I'm not ticked off at you guys about the idea, I'd just like another option.

Maybe something like: Subscribe, get 1000/1000 mist energy pool, have it charge a lot faster (let me craft one thing a day / every two days), and have elevators be 0 cost. The rest of the stuff is not as big a deal to work out IMO. That would stop people from abusing subscription to craft everything 2000 times, and it would let me play the game however much I want, just limits how fast I can improve my gear.

Make pugging less of a brutal nightmare somehow. Possibly involving wood elf magic. I have a hard time meeting people in this game, it is rough to play if you don't come in with a posse of friends.

Make the level puzzles more of a challenge but less of a frustration. (I really hate that one puzzle where you have to choose whether to hit the block that vaporizes the other blocks, or separate it, and the choice you make determines whether you gain access to or vaporize a treasure box you cannot see. On the other hand I love that one puzzle in the Scarlet levels where you have to hit the vaporizer block before going through the gate w/ a ranged attack to get the treasure on the other side.) It is hard to tell if there is any reason to open a treasure based energy door unless I am just not going to spend all my mist energy today. I have never seen this be a good idea.

Improve the big angry bomb. More usage of bombs in lower levels.

More functional Vanaduke strategies other than Shivermist Buster spamming.