Nice intro. The gameplay reminded me of worker placement board games like Agricola and Lords of Waterdeep, except it was single player. Which was a very cool concept.
I agree with everyone else that a tutorial and more descriptive cards would help. You could also just explain more on the game page. In any game jam (I'm pretty sure any) you can update the text, screenshots and look of the page after the submission deadline. So you could do that now and help people playing it the last few days of judging. It is also unclear what if any ending there might be. I just stopped playing because I got bored of the game loop. Also, I couldn't see a need to use the shovel. Maybe I was missing something?
The game has a solid game loop overall.