With the recent Double XP I decided to level up my invention gear in Shattered Worlds and that along with Mod Stu proposing moving the activity has caused the minigame to be on my mind and I wanted to suggest a couple of small improvements.
First whenever you disconnect the activity kicks you out destroying any progress which can be very annoying when a 5 world run can easily take over an hour at higher levels, I'm not sure how difficult this one would be to implement some per world checkpoint that lets you log back in to the world you were on after a disconnect if you were safe and didn't die as a result of the disconnect.
On a similar note, it's mildly annoying that a Sign of Life won't work there as if I take the item (or have the skillcape perk) I expect that safety net as it'd work for any other content.
World Mutators
So until this week, I didn't know that only the starting world per each 5 world run has a set mutator and any additional worlds after the first are random. This randomness can wildly affect success and with some mutators being considered guaranteed deaths on high level worlds, I think the minigame would benefit from a way to change these. My suggestion would be an additional consumable reward that can be bought for anima to reroll the random mutators on worlds after the first.
Rewards
As well as the above suggested reward being added as a consumable, I think the shop could be slightly improved. Currently the "signature items" page has a mix of consumables and one time unlocks and aren't organised in much of an order. Preferably the consumables could be on their own tab, or the one time unlocks should be listed first followed by consumables so it's clearer which are one-offs.
The compressed anima is also as far as I can tell currently useless as it was added to recharge sigils before they were turned into abilities. This should either be removed or reworked (eg. made tradeable to allow profit from SW).