Very interesting way of using the theme : D
It is sadly quite cheeseable in the current state, because you can just walk through the room first round, and then in the others always just have the enemies straight up walk to you so you can just kill them without any danger.
But yeah, I think you have a very cool concept to build upon here. The theming and narrative also worked really well and made it fairly interesting to me ^^
What I genuinely like a lot is the quickness of the teleportation ball. If your ball lies somewhere, and you find an enemy attacking you with theirs, you actually can escape out of danger by being quick enough with teleportation. It feels very rewarding, when pulled off : )