This is a really impressive game to make in a week! I enjoyed the simple, clean graphics and the small touches that you added like opening card packs. Very nicely done!
I realized I couldn't progress once I ran out of gold and didn't have a way to generate more so I had to pass 5 turns in a row until the end. You could make this less punishing by adding some mechanic to gain a small amount of resources. Perhaps unused cards could be turned in for resources at the end of the day. That might avoid players getting hard locked.