A: It's a Mech inspired by the LEGO Mars Mission theme from 2007.
Q: Why did you build it?
A: I made a similar looking mech in person and thought it would be cool to recolor it in the Mars Mission color scheme. I also am a pretty big fan of space LEGO themes and Mars Mission was a favorite when I was younger.
Q: Why do you believe this would make a great LEGO set?
A: Well, almost every LEGO fan likes space themed LEGO sets. Mars Mission was a pretty beloved theme back in the day, so I think that many old and new fans alike will love this set as an homage to the theme.