Hi! I love your game, I appreciate all the work you've done :D and I have a question :o

I completed (the minimum required levels) on World 6, which as far as I know allows me to either (from the main hub) to jump over to the left and access more worlds (worlds 7 through 20 or something like that). However, from the main hub as well you can also access in the top-right corner "a way out" and it brings you to some serene yet intensely quiet setting. There I can break open the 6-key block, which takes me to "Finale- final door" or something like that.. I realize I could probably do this in any order, but I was wondering what is the particular order I'm meant to solve the puzzles after World 6? I also am sure it's also of course open-ended where the player can just play what they want to (like choosing to revisit bonus levels and whatnot or to try tackling them right away). But I'm wondering game development-wise, after you did Worlds 1 thru 6, which one did you make next? The Worlds 7+ or this Finale?? I'd really like feedback on either game dev's suggestion or anyone who also plays this game :>  Whichever order it came out, I'm definitely going to tackle the Finale level first after I get some sleep :D (pulled an all nighter enjoying these amazing levels and wonderful music ^>^)

I also have a separate question. I'm being real serious here, in World 5 there's a level Fool's Gold that looks mathematically impossible ;_;  Is there legit a solution?!?!?   My prediction is that if you break a specific block(s) there are secretly keys in one or some of them, allowing you to open the 24-key block at the end.  But I've been unable to check them all because I just don't see how. I don't really want a solution-spoiler :o  but I would like a little bit of encouragement or to know if I'm on the right track or something :P