I played the game, I like the idea of a "boss rush game" but I dislike the way the time counter works, if I get hit two times in a row at the beginning of a battle, that's -40 seconds and then I only have around 15 seconds which are not enough to deal the necessary dps to beat the boss.
I think the game would be better if you just put some lives to the character and the time it's only there like a Time attack score.