I think the perspective of the archway is off a bit. I don't think we should be able to see that shaded area next to the girl. Maybe?

Could always go for the age old platformer/metroidvania.

"Chicken has warped back in time. There was a problem with the process and the mind altering device needed to enslave the dominate race has broken up and wound up in different parts of the world, battle your way through many different levels as you seek out upgrades for yourself and your weapons, as well as to find the missing parts needed to restore your mind controlling device essential in taking over the world!"

They(platformers) can be done with relatively few tiles as well. As just one full set can act as a template for all the others.
Just some thoughts.

Love the chicken artwork!

I like them as well.

But I dunno, maybe you can add some more of that green here and there and reduce a lot of that noise in the bushes. You really cant see the small flecks of green anyway.

Just did the (viewers left) bushes quickly.
Not sure if I like my edit anymore or less though.

I like it, but I feel like the shadow on her left side(our viewing right) is to large.