Thank you, and apologies for the late response. I thought of making an important-looking door to the level that takes you to the end, and a special sound when it opens, I just never got around to it. What I most wish I could have done was design a few more puzzles that were actually challenging, as most of the levels in this exist just to teach the player how the mechanics work. Whenever this becomes a full game, I plan on it having something around a hundred to a couple hundred puzzles.