The Spriters Roguelike

[Gors]

the tile set looks good but I'd increase the contrast on those blue walls. As for the ceiling tiles, try making them darker so you can easily distinguish different rooms with them.

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Is there a palette or number of colors I should stick to? Or shading style?

there is no set style other than "making it look good with the rest of the sprites"

But generally, there's no outline, few shades, 4 frames for each character (one up, one down and two to the sides). Using already used colors is optional.