Thanks for your detailed feedback. That's what i really need for improving for game.
for "too simplistic and very repetitive", i totally agree and there is a reason. My life was suddenly very busy during the jam period so a lot of content was cut, and the game is barely finished hours before deadline. Originally, i wanted player to be able to switch weapons (with different beat pattern), forced or in purpose. I also wanted to add more undead creatures. some of them may pop out from the ground instead of coming from the edge of stage. But then i ran out of time.
I am planning to make a change after receiving all feedback. So... keep in touch.