Thanks for playing the game. I agree that it is quite hard to know when the song will run out, it would work better if there were lots of instruments at the start and as the song went on instruments dropped out until there was silence. I think a visual indicator would help too. Challenges in the map seem like a good idea as well, maybe opening and closing doors or turrets that shoot slowing shots. It is very difficult to find your way, but its also part of the game play. There could be hints to the general direction of an orb ( maybe a compass) or there could be a map of where you have been, or you could colour in tiles you have been on. There should also be more levels to build up the difficulty and have a shallower difficulty curve, as the first level is relatively hard, but the second is insane. Thanks for giving suggestions!