Great concept, not executed too well
I like this game. I really do. Kind of. I love how different skills are divided into different elements, and leveling them up is great fun. The gameplay itself is simple but in a good way.
However: the difficulty arc is WAY too steep. Yes, the first two levels are perfectly easy. But as soon as warlocks are introduced, the game QUICKLY becomes nearly impossible. And when you continually die within the first minute of the level, and you're at Level 10 or so, it becomes EXTREMELY difficult to gain levels and level up and learn new skills. Which makes the game no easier. To squeeze this kind of a game into 9 levels, the difficulty arc almost has to b steep, unless the game doesn't really get difficult. If you want to make a game like this, make it reasonable: spread it out over many more levels. Also, the game just gets repetitive. Throw in some mini-bosses and bosses (not just one final boss), and it would be more interesting.