I really like the background art. The gameplay is a little rough, but having to use the side effects of the bad spells to proceed (like jumping with the knockback from the first one) is perfectly on theme.
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For example, when you are moving left, you can repeatedly jump, but when you are moving right, you can only jump once until you lift your finger from the D key and repress it. The player changes the direction they are facing based on where the cursor is relative to the player. This causes the player to run backward until you move the mouse to the other side. It should, of course, change direction when you actually fire the spells.
On the non-gameplay side, the jumping animation has a bit too much horizontal movement for me, but that's just an opinion.
I hope you find this constructive. Making the game you like is what matters :D.