Fun game! I think it needs work with balancing. The enemies move very quickly, the player is hard to control and slow to attack-- it's very unforgiving. Even the little dice guy takes more than 3 hits to kill.
I like your idea to make gambling the level up system. I see potential, it is just too unforgiving. Unless I'm just supposed to dodge the enemies.
Look into Coyote Time too, it would help the platforming feel a lot better :)