Sometimes color palettes can be an asset to the piece; especially when you want to convey a certain mood (like the warm inviting home in that tutorial.) Other times they can get in the way. It's good to work with your colors and not worry a lot about how many you use, but if you find yourself picking out ones that are just a few degrees off from each other I would just pick whichever you like more of the 2 and use that.



I'm actually in the process of cleaning up some old sprite bases I did and trying to reduce the colors used. So far I think I've gotten like 2-3 colors taken out without losing much.