Really fun game.
Throwing the die is really satisfying, as it has pretty fast movement. Simply jumping around was already really fun.
Having these gradual buffs to certain numbers also gave you a slight feeling of progression, like games like Metroid do : D
A bit more variety of enemies / enemy attack patterns would have made this more interesting, and I wasn't too much a fan of the "enemy blocking". He's literally just standing there blocking after you attacked him : D Maybe have him see your attack and then block, so you have to attack some enemies from behind or something.
Also some check points would have been nice. I died at the final boss (I think) but didn't want to start all from the beginning again just to give it another try.
But overall a solid job. Having the basic attacking be fun to execute is a great achievement!