I don't always have emojis in the little grading sheet but I do here for this project, thought it might add some visual representation of their performance.
Generally a 5/5 (100%) on an item means Mastery, 4.5/5 (90%) is satisfactory, 2/5 (less than 50%) means it's not good enough yet, usually just really broken or maybe the interface/code is really ugly.
Different criteria has different grades so for the 8 point one it's 8 points for mastery, 8*0.9, 8*0.5, etc.