Thank you so much for playing and for taking the time to leave such detailed feedback, this is exactly the kind of response that helps me make it better.
You're completely right about the boss. Standing and spamming heavy attacks was not the intended experience (good for testing not challenging lol) and I'm already thinking about how to fix that. The color switching mechanic idea is pretty great. I could add that as an option for the boss waves so not only does the boss attack differently, but he accepts different attacks. I'm going to explore that for a v1.1.0 update along with adding some maybe faster movement to the golem and throwing some goblins into the arena to keep the player on their toes.
Really glad the art, music, and golem voice (I love voice acting in my games) landed well. And happy it never felt cheap or unfair. That was important definitely to me.
A harder, more dynamic boss fight is coming. Thanks for giving me a solid direction to take it!