Hope you replace that scaled-up enemy with some fine-detailled pixel art.
Also the exit arrow seems to be a bit upscaled.
On the right the color variation of the bushes seems to be more distinctable than on the left side - on purpose (lanes opening?)
The red-crossed-blocked-stones: how do you render them on top of the ground somehow the shadow of the cross looks darker than on the light ground which makes them "pop out more" (they look not of "equal height").
As I see the ground-decoration - the one looked like a worm, maybe have some worm crouching over the ground randomly (to make the scenery "alive" and "wiggle everywhere"). Same for some bee-things at the bush-flowers or so. Plenty of possiblities for little insects or other tiny effects.
Aside of this little nitpicking ... it looks awesome and as if it sprang right from the MegaDrive or SNES (with a bit more colors per sprite

). I assume it could even be worth to polish it even more and then sell it for some Euros.
bye
Ron