Pros:
- Nice, clean art style. Very simple and yet effective.
- Selling mechanic is neat. Lots of potential for different strategies.
- Decent variety of cards, especially for a game developed in 7 days.
- I liked the procedurally generated cards that scaled depending on how much gold you had.
Improvements:
- I found the cards quite hard to read. Specifically, its quite confusing working out what the card does depending on how you use it (sell, play, etc.) Perhaps add different icons or styling to the cards depending on what the card does.
- As aerial mentioned, the ability to remove cards from your deck would be useful later game.
Bugs:
- None that I could find ;)
Overall, very polished game. Good Job!