Absolutely wonderful idea. The gameplay reminds me a bit of something like crypt of the necrodancer, what with everyone moving at the same time and having to carefuly position yourself such that you lure enemies right where you want them. The die mechanic really sets it apart from that to me, though.
Something I noticed though that I don't think was intentional was that you could stall to let an enemy approach you by walking into a wall. If this is intentional, I'd add a stall button as a feature in general or maybe design the levels around having certain "stalling points" that take some strategic thinking to get to.
That's more for if you decide to expand this into a full game though, which I really would love to see. As some others have mentioned, this game is simple with the things it does, but it does them incredibly well.