Really cool concept! The controls were a bit too hard for me, though - with a rather unpredictable dash length, it was hard to avoid ranged attacks... I think it could be solved by making you invulnerable while you dash, at least for a portion of it, like most games do? Also, the need to click with the mouse felt a bit unnecessary, given that all the rest of the content is on the keyboard - it would be cool to have attack/dash on the keyboard as well.
Also, I really like the animations of the dice and the ability to alter sides. I think there can be some cool depth in side alterations if you want to develop it further.