IF you receive the loot from a chest then die can you get it from the chest again? (this is assuming someone picked up your items when you died and left.)
Also I agree too many mobs. If you don't have god armor you pretty much instantly die. Either get rid of the cobwebs and lava or get rid of the mobs. Every time I go in my fate is being stuck in a cobweb falling into lava but usually I die from the skeleton that is out of reach that just shot me into the cobweb. So if the skeleton doesn't kill me I would still be doomed cause there is lava below me and there is no way to escape falling into the lava. Here is an example C=cobweb L=lava B=block A=air S=skeletons P=player (note: my feet are in the cobweb)
BBBBBBBBB - ceiling
AAAAAAAAB
SAAAAAAPB
SAAAAAAPB
BBBBBBBCB - floor
BBBBBBBLB
BBBBBBBBB
It might require some thinking in order to understand it. Its hard to picture it from the right perspective.