Your criticism of the boss echoes my own. It is very valid. And it comes down to a few factors with the main one being I quickly put this boss fight together within THREE minutes of the Submission deadline lol. Other than the music ramping up, there was meant to be some truly special and hype moments in this boss fight, but alas it didn't happen that way.
And as for the enemies being hard to see, this was due to a bug caused by how I spawn the Doubt enemies with varied sets of eyes, which is a separate object. I did it in a rather crude way that fell apart when spawning them during gameplay instead of them already being placed in the scene, which caused them to spawn without faces when the boss summoned them.
I appreciate the kind words in the post, I love getting focused reviews like this! Makes the game feel like it was worth the time to be written about :)