Well, from what I gather, you're saying a single hit from him killed you—and that the game encouraged you to attack, even though doing so meant certain death. For starters, he isn't just any boss; he was created for a game jam focused on boss battles. One of the concepts I wanted to implement was precisely a super-powerful boss capable of wiping everything out with a single blow. Also, in case you didn't know, the game wasn't actually designed to be beaten. So, if you never managed to defeat him, that’s why. The idea was sort of a joke or a "troll"—basically, you just go as far as you can.

But you can, in fact, block attacks with the block button.