i agree, i think yellow is happy. But I really like the design Maybe even flipping the gradient so red is more what you notice would convey more of a "mad" feeling.
I agree with the color. Red=Mad. Did you try with some steam coming out? Did you try any other fonts? May I ask why a square vs. round (as in world). Just asking. Nice job. Love the mouth.
I really like the logo. It looks really interesting but I think everyone who has responded so far is right; it just needs a little less "happiness" in the color scheme.
i dig the yellow orange theme, altho yellow can denote happiness, it also encompasses FIRE, so thats kinda evil right ? =) also i really dig the japa style grumpy face, kudos!