Ok, that made the game a lot of fun and I finished it in my first go now that I understand it.
- You say to press 0 or some odd character that looks like a 0 to continue in your startup message. For me, it's C but it takes a lot of keyboard smashing to find that key. That same character shows up in other places in the game.
- Consider adding a tutorial popup in the store that explains more about it. When in the store, maybe have 'Q - More Info' to open a tutorial on the store. In it, try to explain some of what you did to me because it really helps. "The more gold you get on a single line, the more options you'll have in the store.", "Get metal and the foundry on a single line to make a sword or just buy one if you have gold to spare.".
Wherever you decide to put one or both of those tips, it will help players a lot I think.
Great game by the way. Love the slot mechanic.