I completed all 16 levels. Nice variety and exploration of the different nuances of the moveset, plus the later levels with more open-ended solutions that feel more like a strategy game.
Though at the end I still didn't quite have a perfect understanding of some of the mechanics, like when the fireball does and doesn't hit secondary targets with its AoE. And it seemed like Walk wouldn't let me walk to certain tiles - might be invisible monster corpses that still count as obstacles?