BJJ Elo Rankings

Hey guys, this is my first post on here. I'm 16 years old, and I started training in BJJ about a year ago. A few days ago, I built an app where grapplers can get a "chess-style" rating and be ranked globally. I'm not trying to shove anything down anyone's throat; I'm trying to build a community and would love some feedback on what I made. If you have any questions or feedback, please lmk. Thanks!
grappld.com