This is amazing! If you added more levels I'd definitely test them out. I do think a consistent background would make more sense though. Also, if you're not playing fullscreen, on the final level part map intersects with the little itch.io info boxes in the top right corner. Instead of registering clicks on the game, it registers the clicks on those boxes, so you have to go fullscreen to complete it. It's not a big deal, but it is a little annoying until you remember about fullscreen.