The Visuals and vfx is great and the vfx is great too (i noticed some minor bugs there too but I think they don't matter much as it's a game jam) vut the controls feel unresponsive and slow. That like lowered the Fun Factor and the boss hit radius is so big that even if u are away from boss he can hit you.
but i have to say one thing that u really nailed the ui and art and visuals.