Thank you so much! I'm glad you liked it!
I've actually been thinking about the "Sell All" button as a possible improvement. My main concern is that it could turn the game into a clicker, but I agree that the current selling mechanic might feel slow. I'm currently working on improving it to make it faster and more convenient.
And you're right about the upgrades! I wanted to keep it simple for the jam, but they would definitely make progression more interesting!