On the level with the cpu-intensive joke, it is possible to leave yourself with no way to suicide or to complete the level. You should add in a reset button.
Bit of a glitch. When you are inserting coins into their respective slots, if you move your mouse quickly, and click on "buy" before the coin icon shows up again, it freezes the game.
A bit of a glitch: after you pass the young mage competition for the first time, the mages are set permanently to Senior mage and above. The young mages disappear. A bit annoying if you want to start a new game without refreshing.