Lol the song was amazing! I thoroughly enjoyed it, although I listened to most of it from the "The End" game over screen on my first play. My gold was negative most of the time :(
Maybe you could explain the game tutorial in the actual lyrics too? That would be a fun way to explain the concepts. In my first play, I didn't realize the dwarves were bad.
♫ Gus, with his space bar, steals gold from the bank,
and avoid the dwarves who want to steal his gold with a shank♫
Since there wasn't a lot of visual/audio feedback from the dwarves, I didn't realize they were the reason my gold went negative at first. I tend to avoid reading long tutorial text my first playthrough to see if I can pick it up intuitively at first.
My second play was a lot better and i got 1876 instead of 35. One thing that still eludes me is what the 500 gold spells do?
Great work! Love how unique it is despite being a simple game.