It gets boring constantly digging through the "fog" - I'd prefer something similar to Nethack with line-of-sight clearing of the "fog". Also, there's not any real challenge or danger in the game - I never had to ration my energy.

Am I missing something? The only thing that loads is a site explaining the rules... with links to LD19, LD18, and a web counter...

You are right about the boring, but the is 5 different levels!! And THERE IS A CHALLENGE, i wrote it on the site, it's to find the secret altar. Don't judge to hard, it's one of my first games and second ludum dare, anyway first find the altar before you saying this game is boring(i know it is).

About the site: if it doesn't work try refreshing the page, or adding some backslashes to the end of the address(how stupid it doesn't sounds it works) or maybe updating java.

It wasn't clear that I was using energy as I moved so I was confused when I was all of a sudden unable to move.

Well, I always run out of "energy", and seeing nothing at all is really no fun, although it fits the theme. It tried hard to find the altar, but I didn't succeed. :( There's no soundtrack, right ?

Works, but nothing too engaging. Tried it many times, and all I did was wander through very similar looking levels (never found any of the structured ones like in the screenshots) picking up mysteriously one-use axes, hacking through trees, stumbling into sources of pure energy then dying because I hadn't stumbled accurately enough. I didn't find the altar; if it's truly more interesting than the rest of the game, well, it's dangerous to expect players to play through a lot of less interesting stuff to get to an interesting bit.

On a technical level, it works pretty well, though. So well done for getting a working game out in 48h.

It looks nice and the first impression is neat.
However it then falls apart due to two problems: First the energy limit seems to be rather arbitrary. Second the challenge is missing.

I found the energy stash room but I have no idea where to look for the altar. Probably behind lots of red doors ;)

With a bit more balancing this could be neat.