I don't know how perspective works with video games like this either.  I was trying to keep it artistic and believeable. 

Thanks for all the comments.  :)

Nice!

Only crits would be the size of sprites is random relatively to perspective (although I have no idea how actual games work with persp); and the lava river should be less noisy in the bg.

Cool! Looks very retro. Nice coloring

not bad, the creature second from the front looks like it needs a shadow but apart from that this is a nice piece