Greetings Vincent, one of the things I loved about your game the most was the fireball being casts from the wizard. The movement of the fireball was so smooth and fast and I enjoyed the sound effect that played when it was cast as well. I also loved the background music and thought it fit the overall theme of the game. I loved the assets you used for the monsters(and the faces they made).
What I think could be improved is the collision detection when the wizard collides with the walls. I noticed that the wizard would get stuck on the wall a few times. I also noticed that for some of the enemies that shot fireballs at the player, those enemies were a far enough distance away that I couldn't quite make out where they were located. I think it would improve the game if you made it so the enemies would only shoot at the player once the player can see them so the player has a little more time to react.
Overall, I enjoyed the theme that you attributed to the game and I also thought the puffy clouds looked cool and added to the aesthetics of the map. I also appreciate how the mechanics were straight forward(A + D to move left and right, W to jump ).