Creative puzzle mechanic and nice level design! You managed to introduce a fairly detailed puzzler mechanism without alphanumeric characters, well done. The pixel art was polished and cute.
I certainly felt the difficulty at points, where the clunky monster radius + follow behavior while carrying an orb felt a bit smothering with little opportunity for counterplay without restarting the level.
There were a few points where the light <-> dark switchover with the orbs gets you clipped/stuck in the level and you have to restart.