The pixelated mage

This is my first game that i am currently working on in school. The engine is made by my teacher, but all the graphics, the UI, the walls and the invulnability function is made by me.

At this point i don?t got any sounds, but the game is otherwise fully playable!

I would like to get some constructive criticism of what i could improve with the game! (remember that im pretty new to programming when giving the critic)