I think there's a really nice basis for this to be fleshed out a bit into something that could be really fun. As it stands, it was satisfying to watch the chain go (although the sounds get loud when you hit a chain with 200+ enemies), and even though the game didn't enforce it, I had fun reacting to the randomness of the attack by changing my movement pattern to try to avoid the enemies. I think this is a really cool starting point and I could see it being expanded into kind of a vampire-survivors-like, but where the focus is on reacting to the paths cleared out by your chain to move around and avoid enemies. Anyway, that's just the thought I had here. Even as-is, I enjoyed playing with this and I had a good time watching the shapes that came out of the chain and seeing the enemies get deleted.
Nice work!