Its a really cool game, I love the idea of timing your attacks depending on the timer. I think making the timer bigger so its easier to make judgements would be great, and even making the countdown slightly longer than 1 second each time as a form of coyote time so that the player can make the decision they intend to.
also adding more juice to attacks and deaths, maybe some screen shake and squash/stretch when attacks land and when enemies die (for example)
Still a really fun game though and one of the better submissions to the jam!