Absolutely took a long time. Time-wise, I would say atleast a whole days worth per world, since there are 3 variations of the levels for each world. So 9 levels total. I even scrapped most of the disco stage levels once or twice and started over lol.
Super ecstatic that you appreciate the level design and noticed how much I play-tested them because yeah, it was a lot. Thanks for checking out the game, glad you enjoyed it :)