Dude, yeah. wow. don't even know how I missed that. There are also some jaggies on the hatchet that need cleaning up. I'll probably do an edit of this

some Anti Alaising would do this peice a world of good, some of your lines are a bit weird and could use some refinement for example look at the medi bag, parts of its out line pixel edge go 2 over and 2 down, this could easily be changed to 1 over 1 down 1 over 1 down, and have a much smoother line.

 hmm. I might try the outlines. Or perhaps lightening the wood background... I get what you're saying though. In regards to the black area under the ground, maybe i'll put in some underground details or something. I just want to avoid using too much brown, or breaking the art style. Thanks for the feedback!

 Again, this is brillaint, but its washed out. I'd still suggest making  more saturated outlines of the items, the rifle is really hard to see, try making an outline.

 I like the bag and that indicators on the bottom, but the overall impression is that the screen is too dark, and needs some lighter shades to stand. that enormous black part in the background doesn't help at all.