I love the idea behind this game. I would recommend making it a little more clear if there's a limit to the amount of cards you can drag to the top bar, though, because I tried to drag more than one reload card but they wouldn't stick.
Heya, the snapping of cards to the top bar is a bit janky - the cards favor the left upper corner for snapping. That should be the issue at hand, since there is no limit to the amount or type of cards except the time limit! Thank you for your feedback, we will definitely look into it more though :)