This was a bunch of fun, and very challenging!
I managed to get myself stuck on puzzle 3 and found myself wishing that I had a puzzle reset button. I also really wish there was an option for inverting the mouse Y axis!
I hope you've had positive experiences using the Godot engine, and thanks for making Linux builds!
P.S. Thanks for the walkthrough for puzzle 5 - even using it, it still took me several goes to get the sequencing right :D