Quite an interesting idea! 2D platformers are a classic, so the controls are intuitive. The dice abilities are interesting and are a concept that I think could be amazing when fleshed out. As you mentioned in other comments, a way to change them besides just hitting reroll might add more depth. Maybe there's things on the map that reroll? I'm not sure, but I think this is quite a cool concept! And I enjoy the style of it all.