Great idea, well done! The typing mechanism is good. But you shoud avoid to use the mouse and let the player attack with athe keyboard to switch everytime between both. Morevoer, it could be a good tip for the player if the background of your spell slots contain le "1" and "2".
The game froze when I reached the 27th wave. I was equipping a new spell and was being attacked on the same time.
Anyway, 5 stars for me.
Et merci pour l'AZERTY ;)