The washing machines started as a joke when I saw the extra theme, but it does become one of my favorite part in the game.
I do notice the some part of the stages are harder than the bosses, but I don't want to risk making the game unbalanced by retweaking the bullet pattern. Not to mention how counterintuitive RPG Maker for making a bullet hell. I also afraid the stages are harder only in my mind at the time since I have developer bias.
Anyway, thank you for playing! Glad you enjoy it.