Love the art and music control seems fluent enough, the only thing I would think would make it more fun is some sort of monster, maybe a feature to attack them maybe just have a scary monster roam the caves..
Overall
Art 4/5
Sound 4/5
Controls 2.5/5
Addictiveness 2.5/5
(p.s): this could easily be an amazing game with some tweaks and different things added here and there..Good luck.