Like StealthC commented, I also found out I could collect the same chest twice before it despawns. In fact, when I was quick enough I could trigger the same chest three times. :D
The very dark visuals make for an interesting situation; the player has to be careful when approaching a yellow marker, since it could turn out to be a chest or an enemy.
My first try included falling off the edge of the map because I like to explored. The second time, using the multi-chest exploit, I managed to win in just two deaths. I think that if I'd been more cautious I could have managed with only one.
