This is a really cool mechanic you implemented, with how the environment changes in order to progress. It's always been something I admire in games. Although, I'm a bit stuck. I got past the first two rivers to find that object on the ground that I assume lights up torches, but I don't know to actually use it, because nothing lights up when I'm near it, and no amount of pressing keys or clicking helps. I'm sorry I couldn't get any further, the game looks really good though.