Really fantastic! You got so much just spot on, it was a joy. I think a little bit more juice on firing and especially on hitting enemies would've been really nice. The screen transitions and story were both cool additions that both seemed a little slow. I felt like the difficulty was just right for a jam game, though I wouldn't have minded a little more personally. This might be personal preference but the teleport going to the mouse is a little unintuitive compared to being based on movement direction. I do think you could potentially have done more with the theme - bullet hells are already a genre where you rarely want to stop moving, so what does not being able to shoot without moving bring to it? Would've been nice to see that space played in a little, like enemy patterns that are easier to dodge while standing still, that kind of thing. Also real minor thing but I think the mage sprites were actually too shaded, a simpler approach would've stood out a little bit better.
All in all this was a really, really great entry and you should be proud!
Oh, and just fyi had a weird bug playing on a 2560x1080 monitor, where the first level started zoomed in entirely on the player's face - i quit and played on my normal sized monitor and it was fine. Catering to extra wide monitors certainly isn't something anyone needs to do by default.