Most definitely Krita can be used for Pixel Art. Just search n the pixel-art tag! I use it for all my pixel Art so that I have just the one tool between Digital painting and Pixel Art. There are some things that are harder e.g. using fixed palettes, keeping colours limited in number and avoiding unwanted transparency, but Krita is immensely powerful for getting the colours just so and dealing with transparency when you want it, like the Angel here: Tropical Collab . In that collaboration I was using Krita and I believe my collabrator was using Pixel Studio. You can see in the last frame where I have tweaked all the colours, something that is much harder to do in Pixel Art tools.
I suggest starting with canvas sizes n bigger than 128x128 pixels.
There are many things I have fund that help to better the experience of creating with Krita, which is not optimised for Pixel Art and i will try and find where I have recorded them and list them here.
My first: Lizard Pixel Art
Tips for Pixel Art
Pixel perfect line setting for pixel art brushes
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