Don't worry about the profit thing, its just an internet meme

Anyway, they were asking you to post up your pixel art, so we don't have to download the zip file, generally its good to link to large images like your concept sketch.





Its probably a good idea to let us know what you intend to do with the art, just let us know where your aiming.
At this point I'd say you've got a nice style going on, would suggest purging the noise in the dirt tiles, its unreadable, and with a low colour count it would look fine as just a single colour. Try defining the forms on your trees better, this isn't really the place to discuss how shading works, but I'm sure you already know or can find it pretty easily, of course we can help once you give us something to work with though.
Love the design of the mech guy, can't wait to see it pixelled, although if you wanna keep that level of detail you might wanna up the dimensions of your tiles a bit.
Keep it up.