First of all great game. Really creative idea and very charming. Love the music, the artstyle, the story and of course the mechanics. Two things I would consider: adding a restart button, so that you can just instantly restart a level and as mentioned in another comment, let the previously placed buttons stay on restart . Sometimes I struggled with a later part of the level and it was hard to remember the exact placements of the first instructions.
Ohh and it took me a while to figure out, that you can place the instructions before moving the queen.
Nice work! Really enjoyed it!