This concept is great. I think you could really expand on this and make an amazing game. Great work for only 4 hours. Here are my suggestions if you continue to work on it: Right now it feels a little bit easy, but I think that could easily be fixed by having less cards on screen, making the cards faster, and making the time slider deplete faster. Some sort of score on screen would help add to the experience. Also, right now you can juggle cards, by moving them up and "saving the for later," it might be interesting to see how this game would play if you were only able to put cards in your hand, and if you wanted to discard a card, it would snap back to it's original trajectory. Anyhow, overall this is a fantastic little game, well done!