Cool game idea. I was able to get a highscore of 27 somehow. Game is quite difficult right now. The game is fun but I think it needs more variety, some audio too. I'd like to be able to cast more than one fireball at once, having to wait for the orb to move doesn't make much sense since the cast already takes up mana while my resource is already also draining over time. You could add a special orb that spawns and eventually goes away after a 10 seconds or so, that gives a large amount of mana or some sort of buff to the player.