I came back today and found a new splash... and supposedly a bug.
Whenever I choose Save & Exit from the settings in the crafting screen after finishing the first level, then immediately return by clicking Continue, the drop items I have earned in that level will be gone.
I have tried reiterating the problem, and while there might be some variables I missed, this seem to affect both dropped elements and crafted items BUT leaving behind player-crafted items created before going to menu via Save & Exit.
I don't know yet if it is the same with the next levels because, well, I'm not wasting those precious items after the struggle :")
Oh and you might find something worth getting rid of in the settings in the crafting menu. Clue: it's blue, it has a cross on it, and it has a twin that functions exactly the same.