I love the idea, but the implementation just leaves me with a bitter taste.
As far as late game and players having unlocked everything there is to unlock is concerned, introducing a currency sink makes sense. Adding longevity, etc., sure.
The idea is amazing, I bet people would love to get a leg up and start with their favourite essence/memory (dunno about you but I sure do), but:
Paying 120 stardust for a rare memory, 350 stardust for a legendary essence or w/e to get a single use out of that currency just feels bad…
After testing it, it seems like a “pay once, use until change” kinda deal. That s a better than expected but seeing the upfront cost almost made me not even try it to begin with. Besides, who knows if I can use my selection without additional cost indefinitely, 10 more times, 1 more time…no clue.
Either way, the amount of stardust gained severely limits the player from interacting with this, fundamentally, very fun mechanic.
That being said:
For starters, if it is a “pay once, use until change” mechanic, I would make that very clear.
Also, from my perspective:
I think it would be neat to have additional Déjà vu slots.
Getting to choose and change the first slot for free at any time sounds fun to me.
Having some hard to earn achievements tied to unlocking additional slots seems entertaining to me.
At that point, getting to use extra slots for a stardust cost seems ok, tho I would still reduce it compared to what we got going now.
Besides, beating the audience guy in the white dream end w/e is hard enough to warrant a proper reward anyway imo, that f is on steroids.