Art is beautiful. Platforming works. It's fine. Overall the gameplay wasn't all that engaging or novel, but it wasn't buggy and it worked.
The attempt to connect with the theme is superficial. What you have is a platforming game with six levels and some RNG in front of it to decide what level to play. You could have just made a platforming game with six levels in sequence, and I think that would have been a better design choice.
Although dice are the theme, dice don't really add anything to this gameplay experience. They're just kind of slapped onto the front to say "look we're doing things with the theme." If you keep working on this game, just take the dice out entirely.