Good job beating the game! You are one of the few! We were aiming to make the puzzles very chaotic, but that got lost throughout the development. Level 19 introduces the conveyer belt tile, but we ended up not really using it anywhere else. Normally we would have made some extra levels where we didn't implement anything new and we would just use all the tiles, including this one, but we were really tired, our creativity was milked dry and the end of the jam was approaching, so we called an end right there.