Now, don't take this the wrong way; I'll just try and explain why you're not getting any replies.
1.
First of all, it doesn't seem like you know what you are talking about.
"8-bit" has become slang for "retro-looking", but what it actually means is processing restriction that forces developers to make do with chip sound, a pallette of maximum 16 colours and tiles no bigger than 16x16 pixels. Usually, anyway.
2.
Though your engine might play great for all I know, there are some jarring things in your screenshot. Now, I'm not referring to your artwork in general (you are looking for an artist, anyway, right?), but the horrible composition of high and low resolution images.
If you want the game to have so-called "pixelart" graphics, you need a consistent frame of pixels, and a steady 1:1 pixel-size ON ALL TILES AND OBJECTS.
Had you been using high resolution images (not pixelart) this wouldn't be such a concern, as it would be hard to spot, but on lower resolutions it's all about imagining lines that aren't necessarily there (because everything is made up of distinct squares), and so consistency is of absolute importance.
I just slapped this together to show you an approximation of how extreme the differences in resolution in your image are:
Now, I might have sounded strict, but I really just want to help.
Remember to use consistent resolution and your games will look and feel much better!