I think the idea of the loop is well implemented, and the idea of a deck builder where you run through a loop of your own creation is an interesting idea.
Sadly, I think your use of the special object was entirely pasted on and had no actual bearing on the game.
The balance also seems off, I'm pretty sure I could just go on forever (although for a weekend gamejam, balance seems like it would be tough to pull off). Choosing to just add vines and healing items to my hand when ever possible though I feel like I could just go on forever since when you run out of cards in hand you can run the loop even if you haven't played stuff to meet the 'danger' level or what ever you want to call it.
It was neat though.