Really fun game, i was so surprised the first time i played but now i really have the hang of it. Also, i realise this is an old game but i thought i should tell you (game developer) a glitch i found so you are aware; At the end when i used zero heart boxes, i pushed the cardboard box aside to reveal the spikes. then i jump on the box and i get the ending where you become a heart box and die. (even tho i used no heart boxes).     Then it tells me that i left heart boxes in two rooms.