Very cool idea, and feels extra thematically to have to instruct your character before starting a level.
For some reason I didn't get any music until I clicked outside of the html-player :/
As others have noted, it would have been nice to keep your instructions placed after pressing reset, got tedious to find a solution for the first part of level 7, have to remember exactly where you placed stuff and then try with further obstacles. Or if instructions snapped to a grid/showed a expected direction/velocity if hit.
Again, very cool idea and something that you could probably keep polishing for a fun timesink!