Something tells me your caffeine intake was crazy during the development - and probably haven't slept for weeks :D
Did not play it through but this looks like a fully developed retro NES game with great art and music, incredible work for such a short time.
One thing that was difficult for me is jumping. Almost everytime when I wanted to jump in a given direction it failed. Since both jumping and moving direction is bound to arrow keys this might come from that, but I'm not sure.