First off, it's really short! I understand that it's a 48 hour jam though, but maybe a good amount of levels should've been a priority. I also don't really see how it relates to the theme.
Another problem I see is that the gameplay is sort of trial and error, you can somewhat tell where the walls might be based on the graphics, but where the chests are is not so clear. To solve that, you might have some sort of indication next to the chests, maybe make the tiles next to the chest gold or have some sort of symbol on them. It doesn't solve the issue entirely, but it makes the player more likely to find the chests, without giving away their exact position.
Anyway, I would say this is quite original. The closest thing I could compare it to is one of those pipe connecting games where you have to make water or whatever flow from one end of the level to the other.
I like the visuals, and the music and sounds fit in with the aesthetic.
This is not a bad idea, but again, I just wish it was longer.