Neat concept, and great for a one day build! I thought the graphics looked accurate to a phone's interface, and the controls themselves were pretty smooth.
I have two main critiques that I think could really improve the experience. First, I think there should be some kind of score count to help measure a player's progress each playthrough. And second, I think a little music would be a nice touch to help enhance the sound effects.
Regardless, it's impressive that you could make this so quickly and have it be so functional. Good job!