Interesting design! for your map scaling wrong in the html, go to unity, then project settings, then player, then resolution & presentation, and change 600 to 540, just a tip :) pretty good game, I just couldn't see some areas, whichis fixed with that resolution thingy hopefully. also couldn't beat the level where blue is on red and there are 2 jump exits at the start, one blocked with green block on right side!
as for the music restarting, make the music a dontdestroyonload prefab :)