I liked the graphics and the main concept of the combat! Unfortunately I found the grid imprecise; sometimes enemies or even the player would be off by a half-step causing an attack to miss or the character to be stuck on a door. The boss battle felt like the best execution of the combat, planning steps to simultaneously avoid attacks and be ready to attack at highest power.
However the dice component really felt a bit forced to me; it was just a counter, had no rolling or randomness component, and even then it only counted 1-5. Didn't feel dice-themed in any significant way.
Unfortunately the sound did not work for me, so I cannot comment on music or SEs.