A bit too epic
The end is a bit too epic. The game is all about the same tactic, until the end, where you have to do something magical to beat it. I tried 3 times and the lowest i could get him was to 20,000 hp. I followed your advice and no dice. My max mana was 9999 and there was nothing I could do to make my mana refill fast enough to cast more angels. Adding a boss to each level might have prepaired me better for the last guy, he just annihilated me the first time around.
I am using the chrome browser on a linux distro. I did notice that the crossbow took a mind of its own on the beginning levels, and I was unable to pan accross the field, but somehow it automagically worked later on.
However, it was enjoyable and the animation was good and stuff.