Your at 5 colors in your submission, sorry I just noticed.
Viewing post in Matrix jam comments
"This includes textures and background. Shade colors do count towards the limit. You may use less colors. picoCAD watermark and alpha transparency channel do not count towards the limit." Yea the background counts, I don't think it'll hurt your standing tho seeing as the modeling is amazing. Sorry I hadn't seen it earlier so you had a chance to change it.