Nice puzzle game concept! It's cool that you added customization options and a level editor, as well. I think that what is currently the 4x speed should be the default (like make that 1x speed and allow the player to go slower if they want). Oh, at some point I accidentally pressed a button and entered some sort of debug mode and couldn't get back out of it. There's a few other areas I could point out for extra polish, like the countdown timer for each step showing a trailing decimal instead of just rounding to the nearest second, but those kinds of things didn't affect the game experience.
I like the art style a lot, and I actually think you should use the in-game graphics for your thumbnail and such because the colors and aesthetic are more appealing to my eye. I couldn't help but laugh at how over the top the songs were, but they did fit the theme! 😂
Overall, fun and pretty complete for a game jam!