Great! One thing though: I would propose putting a couple of words about controls in the "instructions" screen. I just randomly found out that you could move diagonally, and that's a big game changer. Immediately after that I got a win with the spark mage which was something I wasn't able to do before. Maybe I'm just blind, but I don't think this was explained anywhere.
(Also it looks a bit like when going diagonally, you go √2 times farther than going orthogonally, but I'm not sure about that.)