Thank you SOOO much for the really thoughtful and detailed feedback. I really appreciate it. ❤️ It's funny, I tried easily a dozen variations on the 5-block separator and just couldn't find anything that felt right to me either and settled on what you saw. I'll take another crack at it with your suggestion. I also really like your other suggestions for the tutorial text, x-shade, row/column sizing, and being able to rotate the result, and see if I can track down that greying out bug (my code for that is a bit messy, not too surprised a bug managed to sneak in..).
Again, thank you for all the great ideas (☞ﾟ∀ﾟ)☞ you're awesome.