Really cool concept, the game looks and sounds great! Just a few things made it a bit rough.
The spell feels quite good to control but I would have appreciated some better indication and visual emphasis on dangers to be destroyed. I also think it'd be better to have the spell not collide with the witch, as that might have been what made me die the most and didn't feel quite fair.
The witch also seems to sprint a bit too quickly after respawning which, in some levels, forces you to destroy the first obstacles as quickly as possible in a very narrow time frame, which is a bit annoying.
The which's navigation looks kinda weird but good overall, although it did get stuck at a few points. First it got stuck at a point in the second level, which was fine and I just reloaded the game and tried again. Then it also got stuck I think in the 3rd or 4th level where she kept jumping trying to climb a ladder with no success for some reason. I admit that I quit at that point as I didn't feel like starting all over again, so I don't know how much I missed after that (I didn't find any in-level reload button, it would have been useful). I have the screenshots of where these happened though, I can send it here if it's of interest.
Other than that, nice entry! I personally see potential in it.