Really cool and fun game. Sadly I got two consecutive ashes for the last(?) sandwich and therefore couldn't make the sandwich. If this is intentional, I would be kinda sad, because it would tell the player they're at fault for no real ending.
oooh I see!! I didn't undertstand your problem at first sorry. Yeaaah you can't place ashes on top of ashes as you said it, but there's a way to achieve it! hint below: (and thank you for your kind comments!)
hint: as you can't place ashes on ashes, perhaps you will need to place the two cards on each other before they become ashes