It's a nice game but after arriving to level 9, I've been having a lot of game breaking bugs.
First bug came the first time I played (in google chrome) the game window was such that I couldn't see the top and bottom of the screen, so I didn't even know there was an xp bar, and bellow I couldn't see the spell buttons, I just ended up accidentally clicking them. I've retried the game (about 4h afterwards), and it seems to be solved.
Second bug the magma shock wave, chooses a random starting position (sometimes it starts as if an enemy is sending the spell) and ends up disappearing all together when the screen passes the spawning point, this usually leads to:
Third bug although the mana bar is filled, at some point I stop being able to use spells altogether.
It's a shame cause these bugs make the game unplayable but it was pretty enjoyable so far.