It's an interesting idea and a unique combat mechanic for sure.
It feels like you could tweak the combat setup a little bit for some quality of life improvements. If the enemy die had some shake animation for 2 seconds or so before they changed so that it didn't feel as sudden then players could better judge when to approach. If the enemies also progressed in die value in a linear fashion (1->2->3->4->5->6->1) then players could know what value they're looking for on themselves rather than feeling cheap-shot if the enemy switches quickly away from the value that I thought I needed.
Outside of minor gripes like that it is a very solid entry, well done!