Yeah. It was more-so to teach the player that the shop exists and to look forward to it. But unfortunately, due to how much you REPEAT those 5 stages, it feels a bit condescending to constantly get taught the 'lesson' over and over, knowing it's pointless to go in the first time.
The silver set extends the time between the bosses attacks. You might not notice much, but it does make the boss EASIER, in a sense.
I appreciate the criticism! <3