Some ideas for improvement:
1.) Make all packages available so you dont have to wait to cycle through.
2.) Be able to buy at least some vaults and/or keys and/or character slots with fame.
3.) Add either more UT week(ends) or make UTs unsoulbound. People may dupe them, but they just dupe tops now that they dont dupe UTs.
4.) Add in a way to check your achievements on your character (Accurate, friend of the cubes, etc.)
5.) Account for equipment and maxed stats when finding quests (I.e. a 0/8 ninja with t8 equips shouldnt try against the avatar)
Just some suggestions to try to improve the game
Along with vault spaces and keys, you should also be able to buy dyes with fame. I sucks having to buy more and more coins if you just want to dye your charater. They're making enough money off it anyways, why not just make dyes, vaults, and keys cost fame?
first time on earth fissure: kill first guy with 110/230, kill second with 36/110, die on third guy second time through: first guy, 196/230. second, 156/230. third, 98/230. last guy, die while he had regenerated about 5 times, with 11 laft at the end. BIG comparison