I love the retro graphics and the Pixel art style. I'm a fan of colored pixels and I can't imagine a game without including this style in the art. I love the restrictions on shapes, patterns, and combinations that colored dots impose.

In Kezzel Pass I am using two applications mainly.
To work with the PC I use Pyxeledit.
Pros: The TILE MODE, allows you to easily design cell maps.
Cons: Some tools are missing, such as brushes and for handling texts.

When I'm on the go I use the iPad with the Pixel Studio, (There are also versions for Mac, Pc and Android) which I love the DITHERING PEN and of course the ease work of the Appel Pencil.

I'm not a professional, so I'm basically guided by my intuition and trial and error. Channels like Pixel Pete on YouTube are very helpful.

As for the design process that I follow, first I look for a basic shape to guide me and then, little by little I perfect the contour and the interior.
It's very important to choose the color palette from the beginning, since that will help in the main tone (or mood) and the shadows, although I'm afraid that in this field I'm not very good.

I leave you some screenshots with the process.

Regards.