I've had a blast with this game. Implementing magic and spells in a roguelike is always fun, and it's even more enjoyable when you play and can apply different effects to enemies.
Aesthetically, I really like it, from the chosen color palette to the tileset and the catchy music. I would have preferred to cast spells using the keyboard instead of the mouse (I don't know if it's possible to do so with the keyboard; I haven't managed to), but that's just a personal preference.
I didn't read the warning message during my first game and replaced my initial spell, but I quickly realized my mistake and played another game starting with two spells. I haven't reached level 15 yet, but I've had a lot of fun playing this game. Congratulations on the idea and the outcome; there's clearly a lot of work behind it.