With the levels thing, I actually did try to have one level slightly darker than the other, but it didn't seem to help much for me. The elevator lines idea sounds fantastic for that. Love the idea of blocks that require a certain number to be up to be pushed too. Definitely something we'd implement if we worked on this again. And I do agree in hindsight that a lot of the later levels were way larger than they needed to be. Definitely added to the confusion (matter of fact, level 14 was designed to be an annoyingly big level just because I couldn't come up with any ideas).