The game looks really good and the attack feels good. I wasn't sure about the lights going out in the boss room. I sort of just ran in circles waiting for the lights to come back on. Not sure if there was a trick I was missing?
There isn't really a trick, you can try to hit the boss while it's dark or you can try running away! Altough running away from bosses with range attacks makes it a bit harder! Thank you for playing!