Well you earn coins for every battle! Later on also for rescuing civilians. And you can reset the game when you press SpaceBar or pause the game during any battle. There's a button that says "Clear Save Data"!
Viewing post in Winter Falling: Price of Life comments
Well since the dev is here I want to tell you personally that I absolutely LOVE the style of the game, it's quite unique. However, the coins system could use some rebalancing as new players tend to go bankrupt before they reach the boss. There should be a tutorial on managing the currency. I also loved the first Winter Falling, it was a fair challenge but I somehow got to the top of the leaderboard (I think)!