Thanks a lot ! I try to learn to build the skill to teach the mecanism through the puzzles in a non verbal way. I take a lot of inspiration from the Witness obviously. I made this game a long time ago, and I would not build the first levels the same way now probably. They are too simple and a bit boring. It's hard to find the good balance to teah the basics and do something interinsting at the same time. Thanks for the advice !