Thanks for trying it out!
So strange about the black screen. I never encountered that. Might be an issue with the fade-to-black level transition. When it happened, could you still hear music and sound effects? What browser and OS did you use to play it?
And yeah, I definitely need to tweak and rebalance some things, especially the spells and knockback. At first, I thought the bombs would be overpowered if they did too much damage since they release several projectiles, but I didn't factor how hard to aim they'd be.
I'm glad you enjoyed it so far!