I enjoyed this a lot, A LOT. Rules are simple, and from that a whole variety of tactics emerges: collect orbs / lure opponent from orbs / lure opponent into white orbs / kite opponents by warping through walls. I especially liked how you expanded the idea by making custom behaviour for different "bosses" instead of just shoving a lot of enemies into one level. It feels smooth and balanced in terms of speeds and sizes, never too simple or difficult. The art is solid, the music ROCKS. Congrats, you did it!