Really great game, shame its not available in browser then it would get more attention. I recommend people give this one a go. Gameplay and design is great, not on theme really at all but whatev, and it definitely needs to be better balanced.
Definitely need an explanation somewhere, I see theres a tutorial thats unfinished but you could just add text to the description freely. Not a fan of the random cards and limited shops, my second game I got only 1 metal and every recipe required metal and never got another in a shop, Id recommend for gamejams to be easier than you think. Also roads are too expensive, I think 2 rock and a wood would have been better.
Overall though, I think you got a good game on your hands that you could expand on into a legit game, the game loop was solid.