while not perfect, the premise is good.
I personally don't like when the player character is this slow. Maybe it's because the time slow mechanic which didn't show much.
The game seems to be too easy and won't depict the idea of "the trashy mob in the dungeon". There need to be work around on this matter to define the direction of the game. I mean it could be "the wish for revenge make you stronger", or "trying to survive because I'm trash". These will make into different kind of games.