It's amazing. It's the best thing I've played. But I got so sad when I died and lost all my progress! This should be a full-on paid game. It's that great! I personally love the Hollow Dice, as I didn't get any way of upgrading my Energy. If this game had a map or checkpoints every 10 floors (if you die), it would be even better! Perfect, even.
Edit: 5th try, still haven't beaten it.