Thanks for the review! As mentioned on the itch page, I implemented the 'Next' button at 2AM and forgot to actually increment the behind-the-scenes stage counter that's used by the next button to determine what level to send you to; I only realized it this morning when it was too late.
I'm glad you thought the difficulty was fair, as that was one of my main concerns for the game (Super Sequence especially).
Once again, thanks for the review!