I totally get your feelings.
We love difficult games, think of this as a 2D Dark Souls lol.
But yeah a difficulty settings is probably required, although it will need a bit of time
The main issue I had with the boss was the trail extending behind it once it started dashing. Many times I dashed through the boss only for him to start dashing and me land in the trail resulting in instant death. Dodging the trail and the boss was not an issue, but an instantly spawning laser behind the boss after his attack really frustrated me and not in an "oh man I know what I did wrong but I'll get them next time!" kind of way.