The retro low-res look was cool. On the third level where you need 25 gold to proceed, I found the room with lots of gold nuggets, but the lamp did not reveal whether they were good or bad, and I died taking my chances. Was there another way to figure out which were good/bad or was this a bug? Oh also maybe you should find a way to make the text more legible? It was difficult to read unless very, very close.
Overall, really well done. Best next step would be decorations to make the levels look more interesting.