You should just be able to walk through the red block at the bridge once you get the Bronze Key - is that not working for you?
Okay, was able to play after this. I think the concept has a lot of potential, and I had a lot of fun trying to manage exploration, hunger, and items/ammo, but the game definitely needs quite a bit of polish still. I like the themeing and the skeleton designs are really cute. Overall though I think you could definitely look into expanding more on this!! Good job :)