So I've given it a second go, and all I can say is its too complex for a jam game.
I won't say being complex is bad, only in this case it feels like I'm going against what's meant to be end game level bosses as a level 1 player. And I'm not talking stats. Ok yes, first time I played I didn't even know I was meant to use the stat stones and would constantly die in 1-2 hits.
But even with better stats I don't 'understand' when or how to use my skills and my fingers are simply fumbling to hit the right keys at the right time. Its a simply a skill issue, or lack of skill to be more precise.
I won't say its a bad game now that I have a better understanding of what you were going for; but I will say it has a very steep learning curve that would better suit a longer more narrative driven game that gradually eases you in, slowly introducing new skills and mechanics as the game goes.