Love the futuristic-casino visuals, particularly the spawning-in/dying felt good (and the music complements it well!). Congrats on making all your art in the jam time!
I like the concept. Using playing cards and other objects as ramps is cool.
However, the controls of the dice are a finicky (probably because of the cube shape--I'm not sure how to improve this, maybe using a different shape for collision?). Perhaps allowing for some arial control or making jumps less tight would be good too. (I only finished the first two levels.)
The positioning of the camera could be improved as well, as I felt I was fighting it a little.
Great job on the game! The art is fantastic, and there's a ton of potential here.