Beautiful to look at and quite peaceful too, despite the 20 second limit.
It might be nice to make a small visual difference for fallen items that you have already collected. That would give the player a reason to prioritise some items over others and would add a small, extra dimension to the gameplay.
For those of us who are not very familiar with the dropped items, it would be great if they had names as well as descriptions. Knowing what the things are and to be able to go and look them up would help to put players more firmly into the world of the game.
I hope you're planning to make a full-sized game out of this. I can see it being quite wonderful.