This was a fun experience at first. I like that the controls were presented right away and are mostly intuitive. The magic system takes a little getting used to, though. I was also thrown off at first that you fight in one location instead of moving from left to right. Once I got that, it was a little too easy at first, but then got really hard as the number of enemies increased to the point of being overwhelming. The thing that I really didn't like was the boss: it's not clear how you're supposed to hit it. I never completed the first level because I couldn't figure it out.
It's a great start overall. I would have liked a small announcement at the start of the stage that let me know what I was supposed to do and what to expect, maybe a quick tutorial on how to use the magic items. It might also be helpful to tell the player how to damage the boss or make it easier to just spam attack to hit it. Otherwise, I like it.